Gas pressure adjuster

FIELD: engineering of devices for automatic maintenance of pressure of working substance at given level, possible use in systems for supplying natural gas to industrial and communal consumers.

SUBSTANCE: device has body with input and output hollows, locking valve, membrane sensitive mechanism, adjusting valve. Adjusting valve is controlled by membrane drive by second order lever, lever for contact interaction of rod of adjusting valve.

EFFECT: increased device operation reliability.

2 dwg

 

The gas pressure regulator is device to automatically maintain the pressure of the working medium at the specified level and is intended to provide natural gas to industrial and municipal customers.

There are many designs of devices designed to automatically maintain the output pressure of the working medium at the specified level. So, in the publication (Regulating and safety equipment for gas supply systems. Aigrain, Bpeterson, Bperkins. Publishing house of Saratov University, 1989) describes and constructive schemes regulators RDS-50 and RDNA-400.

The disadvantage RDS-50 is a significant intensity due to the coaxial arrangement of the drive and the control valve and low maintainability. Thus, during operation, replacement of worn valve seats and valve possible when fully removing the regulator from the pipeline. Low maintainability constantly criticized by operatives.

The controller design RDNA-400 is slightly better than the regulator RDS-50. Non-axial arrangement of the actuator and control valve, ensuring their cooperation at the expense of a lever of the first kind, allow the use of the membrane actuator of a smaller size, which directly leads to the decrease of metal. But use isawanya spring for relief valve from inlet pressure reduces the accuracy of the output pressure, since the input pressure changes, and the spring force constant.

At the same time consider the gas pressure regulator according to the patent of Russian Federation №1201032 (G 05 D 16/06, 1993, the Construction of this modern regulator. Control valve balanced by a compensatory membrane, added protective membrane.

The disadvantage of this controller is that as in the manufacture of, for revision during operation are not controlled visually the valve stroke and landing him on the saddle. Namely, these parameters determine the capacity of the device. Does not guarantee achievement of the objectives in this patent for the reason that the valve seat and the control valve are installed in different Assembly units: the seat in the body of the regulator, and the valve in the removable housing of the membrane actuator. If the axial displacement "saddle valve" is not so noticeable at high gas costs, aperpendicular stem control valve and the sealing surface of the seat plus the misalignment significantly affect reliability in dead-end mode, i.e. in the absence of gas flow is not provided tightness shutter controller.

The disadvantage of this controller is the absence in its shut-off valve that is triggered when the variance favorable pressure beyond setting minimum and maximum is Alenia operation.

The closest in purpose and nature of the claimed technical solution is chosen as the prototype of the gas pressure regulator according to the patent of Russian Federation №2182720, G 05 D 16/06, 1997, containing the input and output channel to the consumer, diaphragm shut-off valve minimum and maximum pressure with the rod pointer, and the fixing unit, membrane gas reducer and relief valve, the axis of which coincides with the axes of the diaphragm shut-off valve and valve membrane gearbox and seat the last two valves are designed as a single-sided saddle with two concentric support elements. In addition, the control valve is placed in the input cavity and through the associated contact rod interacts at the expense of the lever with the membrane of the gearbox, gas. The lever has a fulcrum for the rotation axis on one-sided saddle from the output cavity.

The main disadvantage of this gas pressure regulator is that the control valve is located in the input cavity and advanced to a step input pressure working environment spring-loaded clamping it to the lever, providing due to the contact of contact engagement with the plunger of the membrane actuator. The absence of the inseparable connection of the valve stem with lever at low costs lead regulator in ibrational mode.

Vibrating mode control valve leads to instability maintain the output pressure at a specified level and, as a rule, entails the destruction of the valve and seat.

Due to the fact that the discharge of gas into the atmosphere when the pressure increases beyond a given value occurs through the gaps paired planting details sensitive mechanism of the minimum and maximum gas pressure, this reduces the reliability of ball retainer due to clogging of the gaps mechanical particles. Even the discharge of gas into the atmosphere from natural gas regulators should be organized through the candle did not have this device.

Another significant disadvantage of this controller is a low indicator of maintainability when the change of the valve block and the membrane actuator require the complete removal of the regulator from the pipeline.

The aim of the present invention is to achieve a guaranteed reliability regulator in the flow range from maximum to completely shut off flow of gas to the consumer, as well as reduce the time to troubleshoot possible problems.

The aim is achieved in that the piston rod of the regulating valve installed in a stepped cylindrical housing having a window for passing the working medium from the inlet cavity to the output, include the tion on the threaded body of the membrane actuator, and an end face located in the output cavity has a saddle valve, and the interaction of the membrane actuator and rod control valve provided with a lever of the second kind via the contact-indissoluble connection of sliding type.

The analysis found in the patent search, information materials for gas pressure regulators for funds regional universal scientific library of Saratov allows us to conclude that the proposed device is not known from the achieved level, i.e. is new.

In addition, the proposed device is not clear from the analyzed sources, i.e. has an inventive step.

The gas pressure regulator according to the claimed invention required industrial useful because it contributes to the reliable and safe use of it when the gas supply industrial and municipal facilities.

The invention is illustrated by drawings.

Figure 1 shows an axial section of a gas pressure regulator; figure 2 - cross section A-a in figure 1.

The gas pressure regulator consists of a housing 1 with an inlet 2 and outlet 3 cavities (channels). In the input cavity 2 is located off valve minimum and maximum gas pressure 4 with sensitive diaphragm mechanism 5. Diaphragm actuator 6 is mounted on the attachment flange of the housing 1 and Rapida thereto by screws 7. Spring 8 provides the setting knob to the desired output pressure due to the pressure of the disk 9. The control valve 10 is located in the output cavity 3. The stem 11 of the valve 10 is installed in a stepped cylindrical housing 12 and has a window 13 for the passage of the working medium from the inlet cavity 2 in the output cavity 3. Cylindrical body 12 on the thread associated with diaphragm actuator 6. The center hole of the actuator 6 and the cylindrical housing 12 and the seat 14 are strictly aligned in the process of manufacturing. From the input and output pressure of the valve 10 is unloaded balanced diaphragm 15. The upper end of the rod 11 extends in podobrannyy the cavity of the actuator 6 and with the help of a second class lever 16 is connected to a lead 17 of the actuator 6. The pivot 18 is made on the rack 19.

Continuity or consistency of the pair of lead 17 and the rod 11 provided with movable joints sliding type. The tube 20 has a transfer pressure of the working medium in podobrannyy the cavity of the actuator 6, and the tube 21 in podobrannyy cavity of the sensing mechanism 5. Shut-off valve 4 has a built-in bypass valve 22 to equalize the pressure when opening after alarm. The opening of valve 4 is carried out with a fork 23 associated with the rod 24, the ends through which the seals are out and have the flats under the removable handle is as the drawing shows).

The gas pressure regulator operates as follows. Starting position: the gas in the cavity 2 is absent, the control valve 10 is open, the gas in the pipeline getparameters missing. Diaphragm actuator 6 is configured to the desired output pressure of the gas.

When the gas supply to the input of the regulator in an open shut-off valve 4 gas through window 13 is supplied to the output 3 and further through the pipeline goes to the consumer. Pulse tubes 20 and 21, the gas pressure is transmitted to the diaphragm of the actuator 6 and the sensing mechanism 5. At the steady state gas throttling gap between the valve 10 and the seat 14 will remain constant.

When changing the gas flow pressure in the pipeline, consumers will be maintained at the required level due to the actuator 6, through which the rod 11 moves the valve 10 adequately changing the throttling gap.

At the termination of the gas pressure in the output cavity 3 and podobrannoj cavity of the actuator 6 will grow. The diaphragm drive lever 16 will close the valve 10 and will ensure its full integrity.

Accidental raising or lowering of the gas pressure in line getparameters membrane sensitive mechanism 5 bends up or down, opens the ball lock 25 and the valve 4 is closed, providing a complete cessation of gas supply to the consumer. The valve 4 from rivets manually after elimination of the reasons, caused its closure.

Troubleshooting procedures common to all regulatory devices, and this seat wear or seal control valve, is made simple by removing the membrane actuator 6 with a cylindrical body 12 and valve 10, after the return of the 4 screws 7. The body 1 of the pipe is removed, which reduces the time for elimination of identified visually Troubleshooting details valve group.

The gas pressure regulator, comprising a housing with inlet and outlet cavities, the shut-off valve minimum and maximum pressure with diaphragm sensing mechanism located in the housing at the side of the input cavity, the membrane actuator for the pilot valve, a lever for contact between the regulating valve and diaphragm actuator, characterized in that the stem of the regulating valve is installed in a cylindrical housing having a window for passing the working medium from the inlet cavity to the output, one end of which the screw is connected with the housing of the membrane actuator, and an end face located in the output cavity has a saddle valve, and the interaction the membrane actuator and rod control valve provided with a lever of the second kind via the contact-indissoluble connection of sliding type.



 

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