Gas pressure regulators. Repair kit for gas pressure regulators type RDG Gas pressure regulator RDG 50n operating principle

15.06.2019

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Over-diaphragm throttle RDG
Sub-membrane throttle RDG
Shut-off valve RDG
RDG pilot valve
Working valve RDG
RDG stabilizer valve
O-ring RDG
Diaphragm of the RDG control mechanism
RDG pilot membrane
Working membrane RDG
RDG stabilizer membrane
RDG shut-off valve spring
RDG pilot valve spring
Spring control mechanism large RDG
RDG pilot spring
RDG stabilizer spring
Control mechanism spring small RDG
RDG pilot seat
RDG regulator saddle
RDG shut-off valve seal
RDG regulator filter
Worker RDG valve stem
RDG control mechanism rod
RDG pilot
RDG stabilizer

Above we have listed the main parts that may fail during operation of the regulator. Currently, in times of crisis, it is often easier to repair a working regulator than to buy a new one. Of course, this is not always cost-effective, but often it is a real solution that is economical in terms of money, but quite labor-intensive. It should be noted right away that repair of regulator RDG-50 should only be carried out by specially trained personnel authorized to this species works! Savings in in this case can lead to dire consequences, ranging from serious damage to the regulator to accidents with human casualties.
RDG-50N can be found without much effort in many supply organizations gas equipment. But it should be taken into account that not everyone understands the intricacies of the gearbox and the differences between the main components. If you decide order repair kit RDG-50N, then first of all you should clarify the manufacturer of this product and preferably the year of its production. The fact is that in appearance we can say that the regulators different manufacturers practically do not differ, but the components may have significant differences. As for RTI, for example, working membrane RDG-50 everyone has the same one. The only way they may differ is in the material.

Some manufacturers make membranes from membrane fabric, and some make them cast. The same goes for pilot membrane RDG-50 And stabilizer membrane RDG-50. But with pilot membranes, things are not so simple. There are several pilot designs. The round membrane of the RDG-50 pilot and the square membrane of the pilot differ not only in shape, but also in size. It is worth paying attention to the throttles.

Throttle RDG-50 may have different design. There was a case when the customer provided the name of the plant, but did not specify the year of production. When spare parts for RDG-50 were installed, it turned out that the chokes were not suitable. They turned out to have experimental regulators, spare parts for which no one had made for a long time. Saddle RDG-50 It’s rare that it’s different for anyone, but it’s still different. When ordering a saddle, as well as valve RDG-50, it is necessary to specify the diameter.
Not a little important aspect when choosing spare parts, the material from which they are made is

are manufactured and the production process itself also leaves its mark on the quality of the parts. For example, if valve seal RDG-50 If the valve is not pressed properly, the valve will not work for long and will have to be repaired again.
Manufacturers are constantly working on the design of their regulators. This is due to the desire to reduce costs, as well as improve the quality and accuracy of work. Technical specialists New designs are being developed and this leads to changes in the internal parts of the regulators.
Regulators RDG-50, RDG-80 and RDG-150 have a similar design and the difference between the repair kits is in the size of the parts. Eg working membrane RDG-150 significantly more than working membrane RDG-80. The same is true with working valves. Due to the difference in bore diameters and, accordingly, bandwidth working valve RDG-150 more than working valve RDG-80, and that in turn is larger than the working valve RDG-50. Components such as the pilot and stabilizer from the same manufacturer do not differ between regulators with different diameters. High regulators do not have a stabilizer in their design, so the cost of the repair kit will be lower. U repair kit RDG-150 price the highest among the three modifications, repair kit RDG-80 price intermediate and, accordingly, for the RDG-50 the price of the repair kit is the lowest.

We provide the opportunity RDG repair kit buy with delivery in Serpukhov, Odintsovo, Krasnogorsk, Khimki, Balashikha, Domodedovo, Lyubertsy, Podolsk, Chekhov, Stupino, Ramenskoye, Korolev, Pushkino, Noginsk, Tambov, Almaty, Atyrau, Aktau, Moscow, Novosibirsk, Nizhny Novgorod, Omsk, Tomsk, Yaroslavl, Petrozavodsk, Kazan, Aktobe, Karaganda, Ulan-Ude, Vladivostok, Khabarovsk, Penza, Kaluga, Volgograd, Chelyabinsk, Yekaterinburg, Ivanovo, Kstovo, Cheboksary, Ryazan, Dzerzhinsk, Rostov-on-Don, Perm , St. Petersburg, Kursk, Tula, Tver, Samara, Voronezh, Naberezhnye Chelny, Tyumen, Gatchina, Vladimir, Veliky Novgorod, Krasnoyarsk, Volzhsky, Belgorod, Rybinsk, Barnaul, Smolensk, Samara, Shchekino, Kemerovo, Orenburg, Surgut, Khasavyurt , Makhachkala, Grozny, Kaspiysk, Ufa, Miass, Krasnodar, Stavropol, Tolyatti, Stary Oskol, Sterlitamak, Ishimbay, Rudny, Bryansk, Kostanay, Uralsk Sochi, Novokuznetsk, Astana, Amursk, Angarsk, Norilsk, Nizhnekamsk, Elista, Biysk, Murmansk , Vladikavkaz, Khanty-Mansiysk, Nalchik, Orel, Kaliningrad, Yoshkar-Ola. To do this, you need to contact us in any way convenient for you.

Technical characteristics of RDG-50-N(V)

	RDG-50-N(V)
Regulated environment	natural gas according to GOST 5542-87
Maximum inlet pressure, MPa	0,1-1,2
Output pressure setting limits, MPa	0,001-0,06(0,06-0,6)
Gas throughput with ρ=0.73 kg/m³, m³/h: R in =0.1 MPa (using N) and R in =0.16 MPa (version B)	1300
Working valve seat diameter, mm:
big	50
small	20
Unevenness of regulation, %	±10
Pressure setting limit of the triggered automatic shutdown device, MPa:
when outlet pressure decreases	0,0003-0,0030...0,01-0,03
when outlet pressure increases	0,003-0,070...0,07-0,7
Connecting dimensions, mm:
D at the inlet pipe	50
D at the outlet pipe	50
Compound	flanged according to GOST 12820
Overall dimensions, mm	435×480×490
Weight, kg	65

Design and operating principle of RDG-50-N(V)

The actuator (see figure) with small 7 and large 8 control valves, shut-off valve 4 and noise suppressor 13 is designed by changing the flow sections of the small and large control valves to automatically maintain a given output pressure in all gas flow modes, including zero, and turn off the gas supply in case of emergency increase or decrease in output pressure. The actuator consists of a cast body 3, inside of which a large seat 5 is installed. The valve seat is replaceable. A diaphragm actuator is attached to the bottom of the housing. The pusher 11 rests on the central seat of the membrane plate 12, and the rod 10 rests on it, transmitting the vertical movement of the membrane plate to the rod 19, at the end of which a small control valve 7 is rigidly fixed. The rod 10 moves in the bushings of the housing guide column. Between the protrusion and the small valve, a large control valve 8 sits freely on the rod, in which the seat of the small valve 7 is located. Both valves are spring-loaded.

Under the large saddle 5 there is a noise suppressor in the form of a glass with slotted holes.

Stabilizer 1 is designed (in version “N”) to maintain constant pressure at the inlet to the control regulator, i.e., to eliminate the influence of fluctuations in output pressure on the operation of the regulator as a whole. The stabilizer is designed as a regulator direct action and includes: body, diaphragm assembly, head, pusher, valve with spring, seat, cup and spring for setting the stabilizer to a given pressure before entering the control regulator. The pressure on the pressure gauge after the stabilizer must be at least 0.2 MPa (to ensure stable flow).

Stabilizer 1 (for version “B”) maintains constant pressure behind the regulator by maintaining constant pressure in the sub-membrane cavity of the actuator. The stabilizer is designed as a direct-acting regulator. In the stabilizer, unlike the control regulator, the above-membrane cavity is not connected to the above-membrane cavity of the actuator, and a stiffer spring is installed to adjust the regulator. Using the adjusting glass, the regulator is adjusted to the specified output pressure.

The pressure regulator 20 generates control pressure in the submembrane cavity of the actuator in order to reset the control valves of the control system. The control regulator includes the following parts and assemblies: body, head, assembly, membranes; a pusher, a valve with a spring, a seat, a glass and a spring to adjust the regulator to a given output pressure. Using the adjusting glass of the control regulator (for version “N”), the pressure regulator is adjusted to the specified output pressure.

Adjustable chokes 17, 18 from the submembrane cavity of the actuator and on the discharge impulse tube are used to set the regulator to quiet (without fluctuations) operation. The adjustable throttle includes: a body, a slotted needle and a plug.

The pressure gauge is designed to monitor the pressure in front of the control regulator.

The control mechanism 2 of the shut-off valve is designed to continuously monitor the output pressure and issue a signal to activate the shut-off valve in the actuator in the event of an emergency increase or decrease in the output pressure above the permissible set values. The control mechanism consists of a detachable housing, a membrane, a rod, a large and a small spring, which balance the action of the output pressure pulse on the membrane.

Filter 9 is designed to purify the gas supplying the stabilizer from mechanical impurities

The regulator works as follows.

Gas inlet pressure flows through the filter to stabilizer 1, then to control regulator 20 (for version “H”). From the control regulator (for version “H”) or the stabilizer (for version “B”), gas flows through an adjustable throttle 18 into the submembrane cavity and through an adjustable throttle 17 into the submembrane cavity of the actuator. Through the throttle washer 21, the above-membrane cavity of the actuator is connected by a pulse tube 14 to the gas pipeline behind the regulator. Due to the continuous flow of gas through the throttle 18, the pressure in front of it, and therefore the submembrane cavity of the actuator, will always be greater than the output pressure during operation. The supra-membrane cavity of the actuator is under the influence of output pressure. The pressure regulator (for version “H”) or stabilizer (for version “B”) maintains a constant pressure, so the pressure in the submembrane cavity will also be constant (in steady state). Any deviations of the output pressure from the set one cause changes in the pressure in the above-membrane cavity of the actuator, which leads to the movement of the control valve to a new equilibrium state corresponding to the new values of inlet pressure and flow rate, while the outlet pressure is restored. In the absence of gas flow, the small 7 and large 8 control valves are closed, which is determined by the action of the springs 6 and the absence of a control pressure difference in the above-membrane and submembrane cavities of the actuator and the action of the output pressure. If there is a minimum gas consumption, a control pressure difference is formed in the above-membrane and under-membrane cavities of the actuator, as a result of which the membrane 12 will begin to move under the action of the resulting lift force. Through the pusher 11 and the rod 10, the movement of the membrane is transmitted to the rod 19, at the end of which the small valve 7 is rigidly fixed, as a result of which the passage of gas opens through the gap formed between the seal of the small valve and the small seat, which is directly installed in the large valve 8. In this case, the valve under the action of spring 6 and inlet pressure it is pressed against the large seat, so the flow rate is determined by the flow area of the small valve. With a further increase in gas flow under the influence of the control differential pressure in the indicated cavities of the actuator, the membrane 12 will begin to move further and the rod with its protrusion will begin to open the large valve and increase the passage of gas through the additionally formed gap between the valve seal 8 and the large seat 5. When the gas flow rate decreases, the large valve 8 is under the action of a spring and flows out into reverse side under the influence of a modified control differential pressure in the cavities of the actuator rod 19 with protrusions, the flow area of the large valve will be reduced and subsequently will close the large seat 5. The regulator will begin to operate in low load modes.

With a further decrease in gas flow, the small valve 7, under the action of the spring 6 and the changed control pressure difference in the cavities of the actuator, together with the membrane 12, will move further in the opposite direction and reduce the gas flow.

If there is no gas flow, small valve 7 will close the small seat. In the event of an emergency increase and decrease in the output pressure, the membrane of the control mechanism 2 moves left and right, the shut-off valve lever 4 comes out of contact with the rod 16, the shut-off valve, under the action of the spring 15, will shut off the gas flow of the regulator.

1 - stabilizer; 2 - control mechanism; 3 — actuator housing; 4 — shut-off valve; 5 — large saddle; 6 — springs of small and large control valves; 7, 8 — small and large control valve; 9 - filter; 10 — rod of the actuator; 11 — pusher; 12 — membrane of the actuator; 13—silencer; 14 — pulse tube of the output gas pipeline; 15 — shut-off valve spring; 16 — control mechanism rod; 17, 18 — regulating throttles; 19 — rod; 20 — control regulator; 21 — throttle washer

Gas pressure regulator RDG-50N, RDG-50V is a device that reduces gas pressure from high and medium values to a certain level. The gearbox refers to gearboxes after itself. The pressure value set by the consumer is maintained automatically. To prevent emergency situations arising due to sharp growth or pressure drop, the regulator is equipped with a blocking device. Operation of the device is allowed at ambient temperatures from -40 to +60 o C. Normal operation of the gearbox at low temperatures will be provided under conditions in which relative humidity gas passing through the reducer is less than 1. Under such conditions, the formation of condensation is excluded.

Technical characteristics of RDG-50N, RDG-50V

Parameter name	RDG-50N	RDG-50V
Working environment	Natural gas according to GOST 5542-87
Maximum inlet pressure, MPa	1,2
Seat diameter, mm	25,35,40,42,45
Output pressure setting range, kPa	160	30-600
Setting range of the shutdown device, kPa - when the output pressure decreases - when the output pressure increases	0,3-31,4-12	3-3037,5-160
Accuracy of operation of the disconnecting device, %, no more	±5
Housing material	Aluminum AK7ch GOST 1583-93
Construction length, mm	365±2
Diameter conditional passage input/output, mm	50/50
Overall dimensions, mm, no more than length-width-height	430482503	430405509
Weight, kg, no more	28	26

Installation of regulator RDG-50N, RDG-50V

The reducer is mounted on a horizontal pipeline with the membrane chamber facing down. The impulse pipeline to the regulator from the outlet gas pipeline must have a diameter of at least 20 mm. The impulse pipeline to the control mechanism from the outlet gas pipeline must have a nominal diameter of at least 15 mm.

To periodically check the operation of the shut-off device on the impulse pipeline to the control mechanism, it is necessary to provide a pressure fitting and a pressure gauge. When inserting impulse pipelines into a gas pipeline, holes in the gas pipeline should be drilled, not cut welding torch, in order to avoid metal deposits on the wall, which can lead to distortion of the selected pressure pulse.

Pulse insertion locations controlled pressure should be on a straight section of the main gas pipeline following the expansion, at a distance equal to 5...10 diameters of the gas pipeline. The pulse injection points should be located in the upper part of the gas pipeline.

A pressure gauge is placed in front of the reducer to measure the inlet pressure. A pressure gauge for measuring the outlet pressure is installed at the top point of the gas pipeline in close proximity to the pulse sampling points. The tightness of the actuator, stabilizer, control regulator, control mechanism is checked by test running the regulator. In this case, the maximum input and output pressure for the gearbox under test is adjusted, and the tightness is determined using a soap solution. Testing the regulator with water is prohibited! The gearbox is pressurized with a pressure not exceeding the pressure in the passport.

IN standard repair kit RDG-50N(V) is missing. Upon additional order, the gearbox is equipped with all the necessary spare parts, the composition of which is determined by the customer himself.

Possible markings:

RDG-50N/25

RDG-50N/30

RDG-50N/35

RDG-50N/40

RDG-50N/45

Throughput of the regulator RDG-50N(V).

Rvx. MPa	RDG-50N (saddle 30mm)	RDG-50V (30mm saddle)	RDG-50N (saddle 35mm)	RDG-50V (saddle 35mm)	RDG-50N (saddle 40mm)	RDG-50V (saddle 40mm)	RDG-50N (saddle 45mm)	RDG-50V (saddle 45mm)

To find out the price, specifications, passport RDG-50, you just need to contact our managers.

Type: gas pressure regulator.

The RDG-80 regulator is intended for installation in gas control points of gas distribution systems of urban and rural gas supply systems settlements, in hydraulic fracturing and gas control units of industrial and municipal enterprises.

The gas regulator RDG-80 provides a reduction in gas inlet pressure and automatic maintenance specified outlet pressure regardless of changes in gas flow and inlet pressure.

The gas regulator RDG-80 as part of gas control points for hydraulic fracturing is used in gas supply systems for industrial, agricultural and municipal facilities.

The operating conditions of the regulators must comply climatic version U2 GOST 15150-69 with ambient temperature:

From minus 45 to plus 40 °C in the manufacture of body parts from aluminum alloys;

From minus 15 to plus 40 °C in the manufacture of body parts made of gray cast iron.

Stable operation of the regulator at given temperature conditions is ensured by the design of the regulator.

For normal operation ori negative temperatures environment it is necessary that the relative humidity of the gas when it passes through the regulator valves is less than 1, i.e. when moisture loss from the gas in the form of condensate is excluded.

The warranty period is 12 months.

Service life - up to 15 years.

Main technical characteristics of the RDG-80 regulator

Connection to the pipeline: flange according to GOST-12820.

Regulator operating conditions: U2 GOST 15150-69.

Ambient temperature: from minus 45 °C to plus 60 °C.

Regulator weight: no more than 60 kg.

Unevenness of regulation: no more than +- 10%.

Size parameter name	RDG-80N	RDG-80V
Nominal diameter of the inlet flange, DN, mm
Maximum input pressure, MPa (kgf/cm2)	1,2 (12)
Output pressure setting range, MPa	0,001-0,06	0,06-0,6
Seat diameter, mm	65; 70/24*
Range of adjustment of the response pressure of the automatic shutdown device RDG-N when the outlet pressure decreases, MPa	0,0003-0,003
Range of adjustment of the response pressure of the automatic shutdown device RDG-N when the outlet pressure increases, MPa	0,003-0,07
Range of adjustment of the response pressure of the automatic shutdown device RDG-V when the outlet pressure decreases, MPa	0,01-0,03
Range of adjustment of the response pressure of the automatic shutdown device RDG-V when the outlet pressure increases, MPa	0,07-0,7
Connecting dimensions of the inlet pipe, mm	80 GOST 12820-80
Connecting dimensions of the outlet pipe, mm	80 GOST 12820-80

* - The DN 80 regulator is manufactured with a single seat as standard, a double seat is available upon request.

Design of the gas pressure regulator RDG-80 and principle of operation

The RDG-80N and RDG-80V regulators include the following main assembly units:

Actuator;
- control regulator;
- control mechanism;
- stabilizer (for RDG-N).

1. control regulator; 2. control mechanism; 3. body; 4. shut-off valve; 5. valve working; 6. non-adjustable throttle; 7. saddle; 8. adjustable throttle; 9. working membrane; 10. actuator rod; 11. impulse tube; 12. control mechanism rod.

regulator RDG-80V composition

regulator RDG-80N composition

The actuator has a flanged body, inside of which a replaceable seat is installed. A membrane drive is attached to the lower part of the housing, which consists of a membrane, into the central socket of which a pusher rests, and against it is a rod that moves in the bushings of the guide column and transmits the vertical movement of the membrane to the control valve.

The control regulator generates control pressure for the sub-membrane cavity of the membrane drive of the actuator in order to move the control valve.

Using the adjusting glass of the control regulator, the RDG-80 pressure regulator is adjusted to the specified output pressure.

The stabilizer is designed to maintain constant pressure at the inlet to the control regulator (pilot), i.e. to eliminate the influence of input pressure fluctuations on the operation of the regulator as a whole and is installed only on low output pressure regulators RDG-N.

The stabilizer and control regulator (pilot) consist of: a housing, a membrane assembly with a spring load, a working valve, and an adjustment cup.

To control the pressure, an indicator pressure gauge is installed after the stabilizer.

The control mechanism is designed to continuously monitor the output pressure and issue a signal to activate the shut-off valve in the actuator in the event of an emergency increase or decrease in the output pressure above the permissible set values.

The control mechanism consists of a detachable housing, a membrane, a rod, a large and a small adjustment spring, which balance the action of the output pressure pulse on the membrane.

The shut-off valve has a bypass valve, which serves to equalize the pressure in the cavities of the actuator housing before and after the shut-off valve when starting the regulator.

The filter is designed to clean the gas used to control the regulator from mechanical impurities.

The RGD-80 regulator operates as follows. The inlet pressure gas flows through the filter to the stabilizer, then under a pressure of 0.2 MPa into the control regulator (pilot) (for the RDG-N version). Text copied from www.site. From the control regulator (for the RDG-N version), gas flows through an adjustable throttle into the submembrane cavity of the actuator. The above-membrane cavity of the actuator is connected to the gas pipeline behind the regulator through an adjustable throttle and a pulse tube of the inlet gas pipeline.

The pressure in the submembrane cavity of the actuator during operation will always be greater than the output pressure. The supra-membrane cavity of the actuator is under the influence of output pressure. The control regulator (pilot) maintains a constant pressure, so the pressure in the submembrane cavity will also be constant (in steady state).

Any deviation of the output pressure from the set one causes changes in the pressure in the above-membrane cavity of the actuator, which leads to the movement of the control valve to a new equilibrium state corresponding to the new values of the input pressure and flow rate, while the output pressure is restored.

In the absence of gas flow, the valve is closed, which is determined by the absence of a control pressure difference in the above-membrane and submembrane cavities of the actuator and the action of the inlet pressure.

If there is a minimum gas consumption, a control difference is formed in the above-membrane and sub-membrane cavities of the actuator, as a result of which the membrane of the actuator with a rod connected to it, at the end of which the working valve sits freely, will move and open the passage of gas through the gap formed between the valve seal and saddle

With a further increase in gas flow, under the influence of the control differential pressure in the above-mentioned cavities of the actuator, the membrane will begin to move further and the rod with the working valve will begin to increase the passage of gas through the increasing gap between the seal of the working valve and the seat.

When the gas flow rate decreases, the valve, under the influence of a changed control differential pressure in the cavities of the actuator, will reduce the passage of gas through the decreasing gap between the valve seal and the seat, and in the absence of gas flow, the valve will close the seat.

In the event of emergency increases and decreases in output pressure, the membrane of the control mechanism moves to the left or right, the rod of the control mechanism disengages from the stop through the bracket and releases the levers associated with the shut-off valve rod. The shut-off valve, under the action of a spring, blocks the gas inlet into the regulator.

Throughput of regulators RDG-80N and RDG-80V Q m 3 /h saddle 65 mm, p = 0.72 kg/m 3

Pvx, MPa	Rout, kPa
Pvx, MPa	2…10	30	50	60	80	100	150	200	300	400	500	600
0,10	2250	2200	1850	1400
0,15	2800	2800	2800	2750	2600	2350
0,20	3400	3400	3400	3400	3350	3250	2600
0,25	3950	3950	3950	3950	3950	3950	3650	2850
0,30	4500	4500	4500	4500	4500	4500	4450	4000
0,40	5600	5600	5600	5600	5600	5600	5600	5600	4650
0,50	6750	6750	6750	6750	6750	6750	6750	6750	6500	5250
0,60	7850	7850	7850	7850	7850	7850	7850	7850	7850	7300	5750
0,70	9000	9000	9000	9000	9000	9000	9000	9000	9000	8850	8050	6200
0,80	10100	10100	10100	10100	10100	10100	10100	10100	10100	10100	9750	8700
0,90	11200	11200	11200	11200	11200	11200	11200	11200	11200	11200	11150	10550
1,00	12350	12350	12350	12350	12350	12350	12350	12350	12350	12350	12350	12100
1,10	13450	13450	13450	13450	13450	13450	13450	13450	13450	13450	13450	13400
1,20	14600	14600	14600	14600	14600	14600	14600	14600	14600	14600	14600	14600

Overall dimensions of the gas pressure regulator RDG-80

Regulator brand	Length, mm	Construction length, mm	Width, mm	Height, mm
RDG-80N	670	502	560	460
RDG-80V	670	502	560	460

Operation of the RDG-80 regulator

The RDG-80 regulator must be installed on gas pipelines with pressures corresponding to its technical characteristics.

Installation and switching on of regulators must be carried out by a specialized construction, installation and operational organization in accordance with the approved project, technical specifications for construction and installation work, the requirements of SNiP 42-01-2002 and GOST 54983-2012 “Gas distribution systems. Natural gas distribution networks. General requirements for use. Operational documentation".

Elimination of defects when inspecting regulators must be carried out without pressure.

During the test, the increase and decrease in pressure should be carried out smoothly.

Preparation for installation. Unpack the regulator. Check delivery contents.

Remove grease from the surfaces of the regulator parts and wipe them with gasoline.

Check the RDG-80 regulator by external inspection for absence mechanical damage and safety of seals.

Placement and installation.

The RDG-80 regulator is mounted on a horizontal section of the gas pipeline with the membrane chamber facing down. The connection of the regulator to the gas pipeline is flanged in accordance with GOST 12820-80.

The distance from the bottom cover of the membrane chamber to the floor and the gap between the chamber and the wall when installing the regulator in the gas distribution unit and gas distribution unit must be at least 300 mm.

The impulse pipeline connecting the pipeline to the sampling point must have a diameter of DN 25, 32. The connection point of the impulse pipeline must be located on top of the gas pipeline and at a distance from the regulator of at least ten diameters of the outlet pipe of the gas pipeline.

Local narrowing of the flow area impulse pipe not allowed.

The tightness of the actuator, stabilizer 13, control regulator 21, control mechanism 2 is checked by starting the regulator. In this case, the maximum input and output pressure for a given regulator is set, and the tightness is checked using a soap emulsion. Pressure testing of the regulator with a pressure value higher than that specified in the passport is unacceptable.

Operating procedure.

A technical pressure gauge TM 1.6 MPa 1.5 is installed in front of the RDG-80 regulator to measure the inlet pressure.

On the outlet gas pipeline, near the insertion point of the impulse tube, a two-pipe pressure and vacuum gauge MV-6000 or a pressure gauge when operating at low pressures, in the same technical pressure gauge TM-0.1 MPa - 1.5 when operating at medium gas pressure.

When the RDG-80 regulator is put into operation, control regulator 1 is adjusted to the value of the given output pressure of the regulator, reconfiguration of the regulator from one output pressure to another is also carried out by control regulator 11, while by screwing in the adjusting cup of the control regulator diaphragm spring, we increase the pressure, and turning away - lowering.

When self-oscillations appear in the operation of the regulator, they are eliminated by adjusting the throttle. Before putting the regulator into operation, it is necessary to open the bypass valve using the shut-off device lever; arm automatic shutdown devices; the bypass valve will close automatically. If necessary, reconfigure the upper and lower limit The response pressure of the shut-off valve is produced by the large and small adjusting nuts, respectively; by tightening the adjusting nut, we increase the response pressure, and by unscrewing it, we lower it.

Maintenance. The RDG-80V and RDG-80N regulators are subject to periodic inspection and repair. Text copied from www.site. The period of repairs and inspections is determined by the schedule approved by the responsible person.

Technical inspection of the actuator. To inspect the control valve, you need to unscrew the top cover, remove the valve with the stem and clean them. The valve seat and guide bushings should be thoroughly wiped.

If there are nicks and deep scratches the seat should be replaced. The valve stem must move freely in the column bushings. To inspect the membrane, you must remove the bottom cover. The membrane must be inspected and wiped. It is necessary to unscrew the throttle needle, blow it out and wipe it.

Inspection of the stabilizer 13. To inspect the stabilizer, unscrew the top cover, remove the membrane assembly and valve. The membrane and valve must be wiped. When inspecting and assembling the membrane, the sealing surfaces of the flanges should be wiped. Inspection of the control regulator is carried out similarly to inspection of stabilizer 13.

Inspection of the control mechanism. Unscrew the adjusting nuts, remove the springs and the top cover. Inspect and wipe the membrane. Make sure the valve seal is intact. If necessary, replace the membrane. Wipe the sealing surfaces of the housing and cover.

Possible malfunctions of the RDG-80 regulator and methods for eliminating them

Name of the malfunction, external manifestation and additional signs	Probable Causes	Elimination method
The shut-off valve does not provide a tight seal.	Breakage of the shut-off valve spring. Rupture of the shut-off valve seal by the gas flow. Worn seal or damaged shut-off valve.	Replace faulty parts.
The shut-off valve does not operate consistently. Cannot be adjusted.	Breakage of the large spring of the control mechanism.
The shut-off valve does not operate when the outlet pressure drops.	Small breakdown spring mechanism control.	Replace the spring, adjust the control mechanism.
The shut-off valve does not operate during emergency increases and decreases in output pressure.	Rupture of the control mechanism membrane.	Replace the membrane, adjust the control mechanism.
As the outlet pressure increases (decreases), the outlet pressure sharply increases (decreases).	Rupture of the actuator membrane. Wear of sealing gaskets of control valves. Rupture of the stabilizer membrane. Rupture of the control regulator membrane.	Replace faulty membranes, gaskets, seat.

Technical characteristics of RDG-80-N(V)

	RDG-80-N(V)
Regulated environment	natural gas according to GOST 5542-87
Maximum inlet pressure, MPa	0,1-1,2
Output pressure setting limits, MPa	0,001-0,06(0,06-0,6)
Gas throughput with ρ=0.73 kg/m³, m³/h: R in =0.1 MPa (using N) and R in =0.16 MPa (version B)	2200
Working valve seat diameter, mm:
big	80
small	30
Unevenness of regulation, %	±10
Pressure setting limit of the triggered automatic shutdown device, MPa:
when outlet pressure decreases	0,0003-0,0030...0,01-0,03
when outlet pressure increases	0,003-0,070...0,07-0,7
Connecting dimensions, mm:
D at the inlet pipe	80
D at the outlet pipe	80
Compound	flanged according to GOST 12820
Overall dimensions, mm	575×585×580
Weight, kg	105

Design and operating principle of RDG-80-N(V)

Under the large saddle 5 there is a noise suppressor in the form of a glass with slotted holes.

Stabilizer 1 is designed (in version “N”) to maintain constant pressure at the inlet to the control regulator, i.e., to eliminate the influence of fluctuations in output pressure on the operation of the regulator as a whole. The stabilizer is made in the form of a direct-acting regulator and includes: a body, a membrane assembly, a head, a pusher, a valve with a spring, a seat, a glass and a spring for adjusting the stabilizer to a given pressure before entering the control regulator. The pressure on the pressure gauge after the stabilizer must be at least 0.2 MPa (to ensure stable flow).

The pressure gauge is designed to monitor the pressure in front of the control regulator.

Filter 9 is designed to purify the gas supplying the stabilizer from mechanical impurities

The regulator works as follows.

The input pressure gas flows through the filter to the stabilizer 1, then to the control regulator 20 (for version “N”). From the control regulator (for version “H”) or the stabilizer (for version “B”), gas flows through an adjustable throttle 18 into the submembrane cavity and through an adjustable throttle 17 into the submembrane cavity of the actuator. Through the throttle washer 21, the above-membrane cavity of the actuator is connected by a pulse tube 14 to the gas pipeline behind the regulator. Due to the continuous flow of gas through the throttle 18, the pressure in front of it, and therefore the submembrane cavity of the actuator, will always be greater than the output pressure during operation. The supra-membrane cavity of the actuator is under the influence of output pressure. The pressure regulator (for version “H”) or stabilizer (for version “B”) maintains a constant pressure, so the pressure in the submembrane cavity will also be constant (in steady state). Any deviations of the output pressure from the set one cause changes in the pressure in the above-membrane cavity of the actuator, which leads to the movement of the control valve to a new equilibrium state corresponding to the new values of inlet pressure and flow rate, while the outlet pressure is restored. In the absence of gas flow, the small 7 and large 8 control valves are closed, which is determined by the action of the springs 6 and the absence of a control pressure difference in the above-membrane and submembrane cavities of the actuator and the action of the output pressure. If there is a minimum gas consumption, a control pressure difference is formed in the above-membrane and under-membrane cavities of the actuator, as a result of which the membrane 12 will begin to move under the action of the resulting lift force. Through the pusher 11 and the rod 10, the movement of the membrane is transmitted to the rod 19, at the end of which the small valve 7 is rigidly fixed, as a result of which the passage of gas opens through the gap formed between the seal of the small valve and the small seat, which is directly installed in the large valve 8. In this case, the valve under the action of spring 6 and inlet pressure it is pressed against the large seat, so the flow rate is determined by the flow area of the small valve. With a further increase in gas flow under the influence of the control differential pressure in the indicated cavities of the actuator, the membrane 12 will begin to move further and the rod with its protrusion will begin to open the large valve and increase the passage of gas through the additionally formed gap between the valve seal 8 and the large seat 5. When the gas flow rate decreases, the large valve 8, under the action of a spring and moving in the opposite direction under the influence of a modified control pressure difference in the cavities of the actuator rod 19 with protrusions, will reduce the flow area of the large valve and subsequently close the large seat 5. The regulator will begin to operate in low load modes.

Gas pressure regulators. Repair kit for gas pressure regulators type RDG Gas pressure regulator RDG 50n operating principle

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