Type: universal pressure regulator.

Regulator RDUK-2-50 is designed to reduce gas pressure and automatic maintenance set pressure at the outlet and installations in gas control points (GRP), gas control installations (GRU).

The regulator provides a decrease in the inlet gas pressure and automatic maintenance of the set outlet pressure regardless of changes in the gas flow rate and inlet pressure.

Gas regulator RDUK-2-50 is used in gas supply systems of industrial, agricultural and municipal facilities.

Basic technical data of the RDUK-2-50 regulator

Type: universal gas pressure regulator.

Climatic performance: U2 GOST 15150-69.

Ambient temperature: from minus 45 to plus 40 0 ​​С.

Weight: 15 kg.

Parameter or size name	RDUK-2N-50	RDUK-2V-50
Nominal diameter of the inlet flange, DN mm	50	50
Saddle diameter, mm	25	35
Maximum inlet pressure, MPa (kgf / cm 2)	1,2 (12)	1,2 (12)
Output pressure setting range, MPa (kgf / cm 2)	0,005—0,06 (0,005—0,6)	0,06—0,6 (0,6—6,0)
Maximum throughput, m 3 / h	6000	6000

Device and principle of operation of the regulator RDUK-2-50

dimensions gas pressure regulator RDUK-2-50

Regulator type	construction length, mm	width, mm	height, mm
RDUK-2N-50	230	466	278
RDUK-2V-50	230	466	278

The gas pressure regulator RDUK-2-50 consists of two main units - a control valve 5 and a pilot 20. A diaphragm actuator is attached to the lower part of the body. The pusher 6 rests against the central seat of the plate, and the valve stem 7, which transfers the vertical movement of the diaphragm plate 3 to the regulator valve, rests on it. The stem moves in the guide column of the body 4, a valve with a rubber seal 8 freely sits at the upper end of the stem. The body is closed from above with a cover.

The pilot KN-2 or KV-2 in the piping of pressure regulators act as a command device. The pilot consists of a body 11, a cover 12, a membrane 15 clamped between them, a valve 21, a tuning spring 14 and an adjusting cup 13.

Inlet pressure gas enters the pilot from the top of the housing. After throttling in the pilot, gas flows through pipe 17 into the sub-membrane space of the control valve through a calibrated hole into the damping throttle 1. Excess gas from the sub-membrane space is constantly discharged into the gas pipeline after the regulator through pipe 18 through the throttle installed on the gas pipeline. The appropriate selection of the diameters of the throttles 1 and the throttling on the gas pipeline in the presence of a continuous flow of gas through the pipes 17 and 18 makes it possible to constantly maintain a pressure slightly higher than the outlet pressure in the sub-membrane space of the control valve. This pressure difference on both sides of the membrane 3 forms its lifting force, which is balanced in any steady-state mode of operation of the regulator by the weight of the moving parts and the action of the inlet pressure on the valve 8.

Compression of the pilot spring 14, which determines the value of the gas outlet pressure, is performed by screwing in the adjusting cup 13. The higher the outlet pressure must be, the more the spring must be compressed. When the regulator is inoperative, the spring must be weakened.

With an increase in gas sampling from the gas pipeline, its pressure after the regulator and under the diaphragm of the pilot 15 and the control valve will decrease. The pilot diaphragm under the action of the spring 14 will lower and through the pusher 10 press on the pilot valve 21, compressing the spring 9 located above it. The pilot seat will open slightly more, the gas flow into the sub-diaphragm space of the control valve and its pressure on the bottom of the diaphragm 3 will increase. The diaphragm, rising, will increase the valve lift and gas flow through the regulator.

With a decrease in gas sampling from the gas pipeline, its pressure after the regulator and under the diaphragm of the pilot 15 and the control valve will increase. The pilot diaphragm will rise and cover the flow of gas through the pilot valve into the sub-diaphragm space of the control valve. The gas pressure under the membrane 3, as a result of its discharge through the pipe 18, will decrease, and the membrane, under the action of the increasing gas pressure above it, will drop, and the control valve will reduce the gas flow through the regulator.

The pressure difference on both sides of the diaphragm creates a diaphragm lifting force, which, in any steady state operation of the control regulator, is balanced by the weight of the moving parts and the gas inlet pressure to the valve.

As the outlet gas pressure decreases, the pressure in the space above the membrane will also increase, while in the space under the membrane it will not change. As a result, the membrane rises and slightly opens the valve.

As the outlet gas pressure rises, the pressure in the space above the membrane will also increase, while in the space under the membrane it will not change. As a result, the membrane will lower and cover the valve. Thus, for any deviation of the outlet pressure from the set one, a change in pressure in the space above the diaphragm will cause the valve to move to a new equilibrium position, at which the outlet pressure will be restored.

Indication of safety measures when working with pressure regulator RDUK-2-50

The RDUK-2-50 regulator must be installed on gas pipelines with pressures corresponding to those indicated in the technical specifications.

Installation and switching on of the pressure regulator RDUK-2-50-2 should be carried out by a specialized construction, installation and operating organization in accordance with the approved project, technical conditions for the production of construction and installation works, "safety rules in the gas industry."

Elimination of defects during the revision of regulators should be carried out without the presence of pressure.

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

Preparation of pressure regulator RDUK-2-50 for work

Before starting the pressure regulator, the General requirements training and safety measures provided for in the instructions for starting up a gas control point or gas control unit.

Placement and installation of the regulator RDUK-2-50

The pressure regulator RDUK-2-50-2 is mounted on a horizontal section.

The impulse pipeline 19 and pipes 16 and 18 from the membrane chamber to the main gas pipeline can be connected in various ways:

Impulse tube 19 is connected to the middle of the straight section of the gas pipeline after the regulator with a length of ≈10 of its diameters. The total length of the tube should not exceed 6 m. Tubes 16 and 18 are connected to the gas pipeline after the regulator in a section with a length of ≈100 mm.

Impulse tube 19 is connected to the middle part of the straight section of the hydraulic fracturing bypass, tubes 16 and 18 are connected to the gas pipeline after the regulator in a section with a length of ≈100 mm.

Tubes 19, 16 and 18 are connected to special branch pipe, which is welded to the gas pipeline after the regulator at a distance of at least 5 of its diameters from the nearest turn.

Before starting, the adjusting screw of the control regulator (pilot) must be unscrewed until the spring is completely relaxed.

For the regulator low pressure it is necessary to check the installation of the replaceable spring for the required interval of the regulated outlet pressure.

Operating procedure.

When the pilot spring is completely weakened, the regulator is started by gradually screwing in the pilot adjusting cup.

The required outlet gas pressure is set using a pressure gauge.

For stable operation of the regulator at start-up, it is recommended to ensure minimum consumption gas after it to the purge plug.

To create a flow through the regulator, it is advisable to use not the candle closest to the regulator, but the distant one (if there is more than one candle). In this case, the regulator is adjusted to a heavier operating mode.

After the candle, there should not be a section of the gas pipeline closed during commissioning and start-up. In this case, it is a gas accumulator, which negatively affects the conditions for adjusting the regulator and can lead to fluctuations in gas pressure during commissioning.

Maintenance of the RDUK-2-50 regulator

The RDUK-2-50 regulator is subject to inspection of the technical condition and maintenance according to the approved schedule in accordance with the requirements of PB-12-529-03.

Inspection of the technical condition is carried out as follows:

To inspect the RDUK-2-50-2 control valve, it is necessary to remove the top cover, the valve with the stem and clean them. The valve seat and guide bushings should be thoroughly wiped clean. Carefully inspect the sealing lip of the seat. If there are nicks and deep scratches the seat must be replaced. The valve stem should move freely in the column. The bottom cover must be removed to inspect the membrane. The membrane must be wiped clean.

Typical malfunctions of RDUK-2-50 gas pressure regulators and methods for their elimination

Violation of the operating mode of the RDUK-2-50-2 regulator during operation most often occurs when the main valve stem is jammed, as well as when the throttles on the regulator piping are clogged.

The pilot spring is completely slack, but the outlet pressure rises. The reason is the leakage of the main valve. The remedy is to replace the valve.

The outlet pressure drops to zero. The reason is membrane rupture. Replace the membrane.

The outlet pressure fluctuates strongly at low gas flow rates, regardless of the set pressure. It is eliminated by installing a throttle with a diameter of 3, 4 or 6 mm, respectively, for regulators DN 50, 100, 200 mm, on the branch pipe 16 to the supra-membrane cavity of the control valve. If the elimination of vibrations is not achieved by installing a choke on the tube, then reduce the inlet pressure, and, if necessary, replace the seat and valve with smaller sizes.

Regulator pressure gas RDUK It is used in various hydraulic fracturing and installations as the main device for lowering the working gas pressure and maintaining it at a given level, regardless of fluctuations in the inlet pressure and the value of its flow. The Kazantsev universal gas pressure regulator, as the abbreviation of this device stands for, is used to equip gas supply systems for residential buildings and communal facilities, industrial and agricultural complexes.

Advantages of the RDUK regulator

Regulator pressure gas RDUK has the following list of advantages, for which it is appreciated by its customers:

• Possibility of setting the values ​​of the outlet pressure in a wide range;
• Exceptional bandwidth;
• Low weight and dimensions, simplifying the task of installing RDUK in gas distribution points, cabinet and other gas distribution plants;
• Possibility of reconfiguring the regulator without dismantling it and stopping gas supply to consumers;
• The climatic version of the device allows its operation in the temperature range the environment from –45 ° С to + 40 ° С.

Device and principle of operation of the RDUK regulator

Device RDUK2 has the following features. The pressure regulator is formed by two units - a regulating unit (actuator) and a control unit (command control body, the so-called “pilot”). The type of pilot is selected based on the required outlet pressure that the regulator must provide. According to this principle, models with a low-pressure pilot KH2 (0.005-0.6 kgf / cm2) and high pressure KB2 (0.6–6 kgf / cm2).

The operation of the device is carried out at the expense of the energy of the working environment and is carried out as follows. Gas pressure reduction in the RDUK regulator occurs as a result of movement of the poppet plunger equipped with a rubber seal relative to the valve seat. This movement is performed by the difference between the inlet pressure on the tray and the outlet pressure acting from below.

The high pressure gas that has overcome the filter is fed to the small valve of the pilot unit and, after it, to the under-membrane space of the control valve. Excess gas from under the diaphragm of the control valve is discharged back into the gas pipeline by means of a relief throttle.

The diaphragms of the pilot and the actuator are pulsed with output pressure, which is always lower than the input pressure. Depending on the gas flow rate and the inlet pressure, the pressure under the diaphragm is continuously monitored and automatically corrected by means of the small pilot valve. When the pressure at the outlet from the RDUK changes relative to the set value in the sub-membrane space, the pressure will also change, which will lead to the movement of the main valve to a new equilibrium position and return of the outlet pressure to the required level.

How to buy a gas pressure regulator RDUK

Before buying a pressure regulator RDUK2, it is worth choosing the optimal modification of the device based on the parameters required by the customer for the value of the outlet pressure, the diameter of the seat and the nominal bore (DN). For example, the RDUK regulator with DN 50 design has a 35 mm seat, DN 100 - 50 and 70 mm (low and high pressure, respectively), DN 200 - a saddle of 105 and 140 mm (low and high pressure, respectively). The larger the seat size, the greater the capacity of the modification of the Kazantsev gas pressure regulator.

To clarify the availability of the RDUK regulator modification you are interested in, its current cost or other information of interest about the products presented on our website, you can contact the managers of the company "PKF" SpetsKomplektPribor. e-mail.

Technical characteristics of RDUK

Notes. 1. Regulators RDUK2N (V) -50 are currently not produced. 2. First digit after letter designation type of regulator - diameter of the connecting pipe D y, mm, the second is the diameter of the valve seat, mm.

The maximum throughput of the RDUK2 regulators is shown in Fig. 1 where R 1 , R 2 - respectively inlet and outlet pressure, kg / cm².

Device and principle of operation of RDUK2N (V) -50

In the RDUK2N (V) -50 pressure regulator circuit (see Figures 1, 2), the KN2 control regulator is a command device, and the control valve is an actuator. The work of the pressure regulator is carried out by the energy of the passing working medium.

The inlet pressure gas, in addition to the main valve, enters through the filter to the small valve of the control regulator and after it through the connecting pipe through the damping throttle - under the diaphragm of the control valve. Gas is discharged into the gas pipeline downstream of the pressure regulator through a relief throttle.

The downstream gas pressure is supplied to the diaphragms of the control valve and control regulator through connecting pipes. Due to the continuous flow of gas through the relief throttle, the pressure upstream and therefore below the diaphragm of the control valve is always higher than the outlet pressure.

The pressure difference on both sides of the diaphragm of the control valve forms the lifting force of the diaphragm, which in any steady-state mode of operation of the regulator is balanced by the weight of the moving parts and the action of the inlet pressure on the main valve.

The increased pressure under the diaphragm of the control valve is automatically controlled by the small valve of the control regulator, depending on the gas consumption and the inlet pressure upstream of the regulator.

The force of the outlet pressure on the diaphragm of the control regulator is constantly compared with the force of the lower spring set when adjusting; any slight deviation in outlet pressure will cause the diaphragm and control valve to move. This changes the flow rate of the gas passing through the small valve and, consequently, the pressure under the diaphragm of the control valve.

Thus, for any deviation of the outlet pressure from the target, the change in pressure under the large diaphragm causes the main valve to move to a new equilibrium position, at which the outlet pressure is restored. For example, if the outlet pressure rises with decreasing gas consumption, the diaphragm and control valve will lower slightly. This will reduce the gas flow through the small valve, which will cause a decrease in pressure under the diaphragm of the control valve. The main valve will begin to close under the action of the inlet pressure until its flow area corresponds to the new gas consumption and the outlet pressure is restored.

During operation, the travel of the diaphragm and control valve required for the full stroke of the main valve is very small, and the change in the forces of both springs at this low stroke, as well as the effect of the varying inlet pressure on the small valve, make up an insignificant part of the effect of the outlet pressure on the diaphragm of the control regulator. This means that the regulator maintains the outlet pressure with changes in gas consumption and inlet pressure due to a slight deviation from the set point. In practice, these deviations are approximately 1-5% of the nominal value.

Manufacturer: LLC PF "Gazservice"

Specifications

Regulator type	Operating pressure		Overall dimensions, mm	Weight, kg
	Inlet Р 1, MPa	Output Р 2, kPa
RDUK2-50 / 35N	0,6	0,6-60	230 x 320 x 300	45
RDUK2-50 / 35V	1,2	60-600	-»-	-»-
RDUK2-100 / 50N	1,2	0,5-60	350 x 464 x 418	92
RDUK2-100 / 50V	1,2	60-600	-»-	-»-
RDUK2-100 / 70N	1,2	0,5-60	-»-	-»-
RDUK2-100 / 70V	1,2	60-600	-»-	-»-
RDUK2-200 / 105N	1,2	0,5-60	600 x 650 x 711	282
RDUK2-200 / 105V	1,2	60-600	-»-	-»-
RDUK2-200 / 140N	0,6	0,5-60	-»-	-»-
RDUK2-200 / 140V	1,2	60-600	-»-	-»-

Note. The first number after the letter designation of the regulator type is the diameter of the connecting pipe D y, the second is the diameter of the valve seat, mm.

The maximum throughput of the RDUK2 regulators is shown in Fig. 4.25-4.29, where P 1, P 2 - respectively inlet and outlet pressure, kg / cm 2.

Ambient temperature - from -30 to +45 ° С.

Device and principle of operation

In the RDUK2 pressure regulator circuit (Fig. 4.23, 4.24), the KN2 low and KV2 high pressure control regulator is a command device, and the control valve is an actuator. The work of the pressure regulator is carried out by the energy of the passing working medium.

The inlet pressure gas, in addition to the main valve, enters through the filter to the small valve of the control regulator and after it through the connecting pipe through the damping throttle - under the diaphragm of the control valve. Gas is discharged into the gas pipeline downstream of the pressure regulator through a relief throttle.

Rice. 4.23. Longitudinal section and connection diagram of the RDUK2-100 regulator. (Control regulator and connection points impulse tubes to the membrane chamber conventionally rotated 90 °)

Rice. 4.24. Longitudinal section and connection diagram of RDUK2-200 regulators. (The control knob and the connection points of the impulse pipes to the diaphragm chamber are conventionally rotated 90 °)

The downstream gas pressure is supplied to the diaphragms of the control valve and control regulator through connecting pipes. Due to the continuous flow of gas through the relief throttle, the pressure upstream and therefore below the diaphragm of the control valve is always higher than the outlet pressure.

The pressure difference on both sides of the diaphragm of the control valve forms the lifting force of the diaphragm, which in any steady-state mode of operation of the regulator is balanced by the weight of the moving parts and the action of the inlet pressure on the main valve.

The increased pressure under the diaphragm of the control valve is automatically controlled by the small valve of the control regulator, depending on the gas consumption and the inlet pressure upstream of the regulator.

The force of the outlet pressure on the diaphragm of the control regulator is constantly compared with the force of the lower spring set when adjusting; any slight deviation in outlet pressure will cause the diaphragm and control valve to move. This changes the flow rate of the gas passing through the small valve and, consequently, the pressure under the diaphragm of the control valve.

Thus, for any deviation of the outlet pressure from the target, the change in pressure under the large diaphragm causes the main valve to move to a new equilibrium position, at which the outlet pressure is restored. For example, if the outlet pressure rises with decreasing gas consumption, the diaphragm and control valve will lower slightly. This will reduce the gas flow through the small valve, which will cause a decrease in pressure under the diaphragm of the control valve. The main valve will begin to close under the action of the inlet pressure until its flow area corresponds to the new gas consumption and the outlet pressure is restored.

Rice. 4.25. Diagram of the maximum throughput of the RDUK2N-50/35 and RDUK2V-50/35 regulators

Rice. 4.26. Diagram of the maximum throughput of the RDUK2N-100/50 and RDUK2V-100/50 regulators

Rice. 4.27. Diagram of the maximum throughput of the RDUK2N-100/70 and RDUK2V-100/70 regulators

Rice. 4.28. Diagram of the maximum throughput of the RDUK2N-200/105 and RDUK2V-200/105 regulators

Rice. 4.29. Diagram of the maximum throughput of the RDUK2N-200/140 and RDUK2V-200/140 regulators

Rice. 4.30. KN2 control regulator

During operation, the stroke of the diaphragm and the control valve valve required for the full stroke of the main valve is very small, and the change in the forces of both springs at this low stroke, as well as the effect of the varying inlet pressure on the small valve, make up an insignificant part of the effect of the outlet pressure on the diaphragm of the control valve ... This means that the regulator maintains the outlet pressure with changes in gas consumption and inlet pressure due to a slight deviation from the set point. In practice, these deviations are approximately 1-5% of the nominal value.

To overcome a certain weight of the moving parts of the control valve when it is opened and the resistance of the small valve to the gas flow, a minimum pressure drop of 300 mm of water is required. Art.

Gas pressure regulator RDUK designed to reduce the gas pressure and automatically maintain the outlet pressure within the specified limits, regardless of changes in the inlet pressure and gas flow rate. The regulator is used in gas supply systems of industrial, agricultural and municipal facilities.

DN 50 are manufactured with 35 mm saddle, DN 100 with 50, 70 mm saddle, DN 200 with 105, 140 mm saddle. Seat diameter affects the flow capacity of the regulator; the larger the seat, the greater the flow capacity of the regulator.

On the basis of RDUK gas pressure regulators, we manufacture gas control points and gas control units of cabinet, block type or on a frame.

Produced RDUK models

RDUK is manufactured in the following modifications:

RDUK-50N (V) Du-50 with low or high outlet pressure and a seat diameter of 35 mm - RDUK-50N (V) / 35;

RDUK-100N (V) Du-100 with low or high outlet pressure and seat diameter 50, 70 mm - RDUK-100N (V) / 50 (70);

RDUK-200N (V) Du-200 with low or high outlet pressure and seat diameter 105, 140 mm - RDUK-200N (V) / 105 (140).

Gas pressure regulators RDUK-200 are available in four versions:

With low outlet pressure and a seat diameter of 105 mm - RDUK 200 MN / 105;
- with low outlet pressure and seat diameter 140 mm - RDUK 200 MN / 140;
- with high outlet pressure and a seat diameter of 105 mm - RDUK 200 MV / 105;
- with a high outlet pressure and a seat diameter of 140 mm - RDUK 200 MV / 140.

RDUK throughput:

- RDUK 50 6500 m3 / h

- RDUK 100 12000/24500 m3 / h

- RDUK 200 47000/70000 m3 / h

Climatic version corresponds to US GOST 15150 (from –45о С to + 40о С).

The gas pressure regulator RDUK 200 meets the requirements of GOST 11881, GOST 12820 and a set of documentation according to the RDUK 200M.00.00.00 specification.

Technical and performance characteristics regulators RDUK-50/100/200

Parameter or size name		Values ​​for type or design
		RDUK-2N-50	RDUK-2N-100		RDUK-2N-200
		RDUK-2V-50	RDUK-2V-100		RDUK-2V-200
Nominal diameter of the inlet flange, DN
Saddle diameter, mm
Maximum inlet pressure, MPa (kgf / cm2)		1,2 (12)	1,2 (12)		1,2 (12)	0,6 (6)
Output pressure setting range, MPa (kgf / cm2)	for low pressure regulator	0,005-0,06 (0,05-0,6)
	for high pressure regulator	0,06-0,6 (0,6-6,0)
Maximum throughput, m3 / h, not less		6000	12000	24500	37500	47000
Overall dimensions, mm	face-to-face length
	width
	height
Flanges (design and dimensions) in accordance with GOST 12820-80 for nominal pressure MPa
Weight, kg, no more

Gas regulator RDUK. Overall dimensions and specifications:

Regulator type	Operating pressure		Overall dimensions, mm	Weight, kg
	entrance R 1, MPa	Output R 2, kPa
RDUK2N-50/35	0,6	0,6–60	230 × 320 × 300	45
RDUK2V-50/35,	1,2	60–600	230 × 320 × 300	45
RDUK2N-100/50	1,2	0,5–60	350 × 560 × 450	80
RDUK2V-100/50,	1,2	60–600	350 × 560 × 450	80
RDUK2N-100/70	1,2	0,5–60	350 × 560 × 450	80
RDUK2V-100/70	1,2	60–600	350 × 560 × 450	80
RDUK-200MN / 105	1,2	0,5–60	610 × 710 × 680	300
RDUK-200MV / 105	1,2	60–600	610 × 710 × 680	300
RDUK-200MN / 140	1,2	0,5–60	610 × 710 × 680	300
RDUK-200MV / 140	1,2	60–600	610 × 710 × 680	300
RDUK2N-200/105	1,2	0,5–60	600 × 650 × 690	300
RDUK2V-200/105	1,2	60–600	600 × 650 × 690	300
RDUK2N-200/140	0,6	0,5–60	600 × 650 × 690	300
RDUK2V-200/140	1,2	60–600	600 × 650 × 690	300

The RDUK pressure regulator stands for Kazantsev's universal pressure regulator.

A pressure regulator of this type is installed in order to effect pressure reduction. natural gas... And also to carry out at an automatic level keeping the outlet pressure within strictly specified limits. With all this, the level of this maintenance should not be influenced by fluctuations in either the level of the inlet pressure, or the amount of gas flow.

Gas pressure regulators RDUK are used in a wide variety of areas where gas supply may be required. Such objects can be industrial, such as factories, and other large industrial enterprises, or agricultural, as well as directly public utilities and facilities.

All three models are combined general principle work, however, they also have specific differences that should be taken into account when choosing a regulator, relying on the tasks that need to be solved with the help of its installation.

Basic distinctive feature each of the RDUK pressure regulator models has a seat size. RDUK 2 50 is produced with a saddle size of 35 mm. In turn, the RDUK 2 100 is produced with a saddle size in two variations - 50 and 70 mm. And RDUK 2 200 has a saddle of 105 or 140 mm.

Saddle size is extremely important characteristic for selection the right type and the kind of gas pressure regulator. Therefore, exactly how the seat size, its diameter, has a huge impact on the flow capacity of the regulator. The smaller the saddle, the less such a throughput. Accordingly, a larger size will provide such a regulator with more bandwidth.