Swing check valves

 

The invention relates to valves and is intended for use at compressor stations of main gas pipelines. The swing check valve includes a housing with inlet and outlet nozzles. In pass-through channel of the body, there is mounted on the shaft of the rotary valve plate valve and hydraulic rotary damper. In the case of the damper has two fixed partitions and mounted on its shaft, two rotary blades. Working cavity of the damper is formed by dividing partitions and connected through an adjustable throttle device. The shaft of the damper is connected to the shaft of the valve. Damper is provided for additional capacity. The lowest point of the last placed above the upper generatrix of the inner diameter of the damper casing and through an orifice separately reported with both the working cavity of the damper. The top point of the additional capacitance is connected with the outlet pipe of the valve body pipe. In pass-through channel of the pipeline has a self-cleaning filter element. The invention is directed to improving the reliability and life of swing check valves with hydraulic swing dem the gas. 2 Il.

The invention relates to valves and can be used at compressor stations of main gas pipelines.

Famous swing check valves with a gas damper (see Reference fittings for gas and oil products. - Leningrad: Nedra, 1988, pp. 147-149).

The disadvantage of this valve is the small damping factor of the gas damper device and, as a result, the percussive nature of the closing (opening) of the valve and the surge valve in the open position.

The closest to the technical nature of the claimed invention (the prototype) is a swing check valves with hydraulic damper (see US 4286621 A, class F 16 To 1/20, 01.09.1981), which includes a housing with inlet and outlet nozzles, a flow channel which is placed a rotary plate connected to the rotary shaft of the valve with the lever, and a hydraulic rotary damper, in the case of which there are two fixed walls and the shaft of the damper with a fixed two blades. While working cavity of the damper formed by the dividing walls and filled with damping fluid, connected through adjustable grossularia cavity of the hydraulic damper and the output cavity of the valve are separated on the shaft by means of a dividing seal.

The disadvantage of the prototype is available on the separation of the seal in the process of opening-closing valve differential pressure between the pressure of the damping fluid and gas pressure.

In addition, each cycle of opening and closing of the valve is accompanied by accumulation of gas in the damper fluid.

This circumstance leads to a reduction of the damping coefficient of the hydraulic damper, bringing its characteristics with each cycle of operation to the characteristics of the gas damper: the percussive nature of the closing (opening) of the valve and the surge valve in the open position, which in turn leads to the decrease of the reliability and life of swing check valves with hydraulic damper.

The objective of the invention is to improve the reliability and life of swing check valves with hydraulic damper by creating a design devoid of the disadvantages of the prototype.

The technical result is that the swing check valves with hydraulic damper includes a housing with inlet and outlet nozzles, a flow channel which is placed a rotary plate connected to the rotary shaft of the valve with the lever, and a hydraulic swivel on the blades. While working cavity of the damper formed by the dividing walls and filled with damping fluid, connected through an adjustable throttle device, the shaft of the damper is connected to the shaft of the rotary plates are in the output cavity of the valve, and the working cavity of the hydraulic damper and the output cavity of the valve are separated on the shaft by means of a dividing seal.

What's new is that in the hydraulic damper provides additional capacity, the lower point of which is above the upper generatrix of the inner diameter of the casing and through an orifice separately reported with both the working cavities of the hydraulic damper and the top point is connected to the outlet pipe of the valve body pipe, flow channel which has a self-cleaning filter element.

Due to these essential features, the device acquires the following new properties: - isolating seal that separates on the shaft of the working body of the valve and the damper fluid by supplying the working fluid from the output chamber of the valve at the top point of additional capacity becomes unloaded all modes of atmospheric fluid, as well as possible changes in its volume due to operating temperature changes are compensated by additional capacity; - self-cleaning filter element in the flow channel pipe connecting the upper point of additional capacity with the outlet pipe of the valve body, protects the working cavity of the damper from the ingress of solid mechanical impurities in the gas supply to the additional capacity, which delayed self-cleaning filter element.

The design of the device is shown in Fig.1, in Fig.2 - section a-a in Fig.1.

The device includes a housing 1 with an inlet 2 and outlet 3 nozzles, flow channel which is placed a rotary plate 4 connected to the rotary shaft 12 of the valve when the lever 5, and a hydraulic rotary damper in the housing 8 which has two fixed partitions 9 and the shaft of the damper 6 with a fixed two blade 7. While working cavity of the damper formed by the dividing walls and filled with damping fluid, connected through an adjustable throttle device 11, which is configured characteristics of the hydraulic damper, bespeak pressure pulsation of the gas flow. As in the prototype, working cavities of the hydraulic damper and the output cavity of the valve are separated on the shaft by means of a dividing seal 13.

The hallmark of the device is that it contains an additional capacity of 14, the lower point of which is above the upper generatrix of the inner diameter of the hydraulic damper and through the calibrated holes separately reported with both the working cavities of the hydraulic damper and the top point is connected to the outlet pipe of the valve body pipe 15, a flow channel which has a self-cleaning filter element 16.

The device operates as follows: in all steady-state operating conditions the pressure drop across the separation seal is equal to zero because the pressure of damping fluid in the working cavity of the damper is equal to the gas pressure in the outlet chamber of the valve.

All temperature changes in the volume of the damping fluid are compensated by the change of the level of additional capacity and thus do not affect the pressure of the damping fluid, and hence the differential pressure on the separation seal.

Resource changes in the volume of the damping liquid is asimet working cavity of the damper from falling into them, along with the gas solid mechanical impurities.

Through the use of the above design solutions are improving the reliability and lifetime of the swing check valve with hydraulic damper, increasing turnaround time and thereby lower operating costs of compressor stations of main gas pipelines.

Claims

Swing check valves, comprising a housing with inlet and outlet nozzles, a flow channel which is placed fixed on the shaft of the rotary valve plate valve and hydraulic rotary damper, in the case of which there are two fixed partitions and mounted on the shaft of the damper two rotary blades, with working cavity of the damper formed by dividing walls, connected through an adjustable throttle device and the shaft of the damper is connected to the shaft of the valve, characterized in that the damper provides additional capacity, the lower point of which is placed above the upper generatrix of the inner diameter of the damper casing and through an orifice separately reported with both the working cavity of the damper, while the upper point dopolnitelbnye self-cleaning filter element.

 

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