CN108036086A - Swing check valve with operation device - Google Patents

Abstract

The present invention relates to check-valves technical field, more particularly to the swing check valve with operation device, including swing check valve, swing check valve includes valve body, valve seat, valve deck, the rock shaft being fixedly connected with the valve body, the rocking arm being rotatablely connected with rock shaft and the flap on rocking arm, it is in the valve deck upper mounting bracket, the valve rod of operation device is threadedly coupled with the valve stem nut in operation device, and valve rod lower end is stretched into the valve body of swing check valve；Operation device actuatable valve bar pushes the rocking arm in valve body；The present invention is under special operation condition, it is possible to achieve forward direction closes valve, so that system is correctly run.

Description

Swing check valve with operating device

technical field

The invention relates to the technical field of check valves, in particular to a swing check valve with an operating device.

Background technique

The conventional swing check valve is composed of valve body, valve seat, rocker arm, rocker seat, valve disc, valve disc nut, middle flange bolt, middle flange nut, valve cover and other parts. Swing check valve The check valve plays a role in the system to restrict the reverse flow of the medium, and has the function of cut-off isolation to protect the system and equipment, that is, the medium flows in forward to open the disc, the medium flows in, and the medium flows in reverse to close the valve. The valve switch is affected by the flow direction of the medium. When the medium flows forward, the valve cannot be closed; under special working conditions, it cannot be closed positively.

Contents of the invention

In view of the defects of the existing technology, the technical problem to be solved by the present invention is that under special working conditions, positive closing cannot be realized. The purpose of the present invention is not to be affected by the flow direction of the medium, and the valve can be closed at any time according to the working conditions. so that the system operates correctly.

In order to achieve the above object, the technical solution of the present invention is a swing check valve with an operating device, which includes a swing check valve, a bracket and an operating device. The swing check valve includes a valve body, a valve seat, a valve The cover, the rocker seat fixedly connected with the valve body, the rocker arm rotatably connected with the rocker seat and the valve disc installed on the rocker arm are characterized in that: a bracket is installed on the upper part of the valve cover, the valve stem of the operating device and the operating device The valve stem nut inside is threadedly connected, and the lower end of the valve stem extends into the valve body of the swing check valve; the operating device drives the valve stem to press down the rocker arm in the valve body.

Preferably, the upper and lower ends of the bracket are provided with positioning notches. This arrangement ensures the concentricity when the valve stem moves.

Further, an anti-rotation block is provided between the valve stem and the bracket; the valve stem moves linearly up and down, which can increase the service life of the packing.

Further, the back of the rocker arm is provided with a boss capable of receiving the force of the valve rod moving downward. This setting can better realize the switch of the valve.

Preferably, the boss is an arc-shaped boss.

Further, the bonnet is provided with a leak pipe and a purge hole; the leak pipe and the purge hole are respectively led to the outside of the bonnet by the packing at the seal between the valve stem and the bonnet. The purge hole is mainly used for the disassembly of the packing, and the leakage pipe ensures that the leakage at the packing is zero.

Further, an anti-rotation structure is adopted between the rocker arm and the valve clack.

Preferably, the anti-rotation structure is to cast a boss at the edge of the rocker arm in contact with the valve clack and insert it into the valve clack, leaving a gap between the rocker arm and the valve clack. In this way, when the valve clack is closed, the rocker arm can limit its free rotation without interfering with its sealing on the valve seat.

Further, the valve body and the valve cover adopt a bolted flange structure with wound gasket seal, and a lip weld is reserved at the middle flange to ensure the sealing reliability of the valve.

The beneficial effects of the invention are: under special working conditions, the positive closing of the valve can be realized, so that the system can run correctly.

Working method: the operating device is rotated by the valve stem nut, and the valve stem moves linearly along the vertical direction of the pipeline centerline, and the opening and closing of the valve is completed by pressing down on the stressed part of the rocker arm.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a side view of the present invention;

Fig. 3 is a schematic diagram of the valve closing structure;

Figure 4 is a schematic diagram of the valve disc structure;

Fig. 5 is the sectional view of A-A among Fig. 4;

In the figure: 1. Valve body, 2. Valve seat, 3. Rocker arm, 4. Valve disc, 5. Valve stem, 6. Valve cover, 7. Bracket, 8. Manual device, 9. Packing, 10. Disc spring Group, 11, boss, 12, middle flange stud, 13, middle flange nut, 14, upper sealing seat, 15, wound gasket, 16, plug, 17, stud, 18, nut, 19, Rocking seat, 20, shaft pin, 21, cotter pin, 22, disc nut, 23, gasket, 24, drainage tube, 25, anti-rotation piece, 26, indicator plate, 27, anti-rotation block, 28, valve Rod nut, 29, positioning seam, 30, purge hole.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention clearer, the following will be described in conjunction with the accompanying drawings and specific examples of the description.

The present invention provides a nuclear first-stage swing check valve with an operating device, which is composed of a nuclear-grade swing check valve with a high Cv value, a bracket 7 and an operating device (manual device 8). Swing check valves with operating devices are mainly used in RIS systems. The normal operation of the valve can effectively determine that the system performs the expected safety function. The swing check valve with operating device is composed of a high swing check valve. The check valve plays a role in restricting the reverse flow of the medium in the system, and plays the role of cut-off isolation to protect the system and equipment, that is, the medium flows into the open valve in the forward direction. Flap, medium flow, medium reverse flow to close the valve, the valve switch is affected by the flow direction of the medium, when the medium flows forward, the valve is closed through the bracket connection part and the operating device (manual device).

As shown in Figure 1, the core components of the swing check valve with operating device are valve body 1, valve seat 2, rocker arm 3, valve disc 4, valve stem 5, valve cover 6, bracket 7, manual device 8, etc. Composition of main parts.

The upper end of the support is assembled with the manual device 8, and the lower end is assembled with the valve cover 6. The upper and lower ends of the support 7 are provided with positioning notches 29 to ensure the concentricity of the valve stem 5 when it moves. An anti-rotation block is provided between the valve stem 5 and the bracket 7, and the valve stem 5 moves linearly up and down, which can improve the service life of the packing 9. The valve stem is sealed with packing 9; the disc spring group 10 is added to the packing bolts to compensate for the leakage of the valve from the packing 9 caused by the loosening of bolts or packing 9 during use, and to ensure the sealing effect under long-term use. To make the valve more safe and reliable, the valve body 1 and the valve cover 6 adopt a bolted flange structure sealed with a wound gasket 15, which includes a middle flange stud 12, a middle flange and a middle flange nut 13, which is easy to assemble and disassemble. At the same time, a lip weld is reserved at the middle flange to ensure the sealing reliability of the valve. The bonnet 6 is provided with a leak pipe 24 and a purge hole 30 ; the leak pipe 24 and the purge hole 30 are led out to the outside of the bonnet 6 by the packing at the seal between the valve stem 5 and the bonnet 6 . The purge hole 30 is mainly used for the disassembly of the filler 9, and the leakage pipe 24 ensures that the leakage at the filler 9 is zero.

As shown in the schematic diagram of the rocker arm structure in Figure 2, the rocker arm 3 is made of castings, and an anti-rotation structure is used between the rocker arm 3 and the valve disc 4. When the rocker arm 3 is cast, a boss is cast at the edge of the valve disc 4 and embedded in the valve. In the flap 4, there is a certain gap between the rocker arm 3 and the valve flap 4. When the valve flap 4 is closed, the rocker arm 3 can limit its free rotation but does not interfere with its sealing on the valve seat 2. The main thing is that the back of the rocker arm 3 is cast with a stressed boss 11 which can be subjected to the closing force of the valve rod 5 to realize the switch of the valve.

As shown in the schematic diagram of the valve closing structure in Figure 3, the manual device 8 is rotated by the valve stem nut 28, and the valve stem 5 moves linearly along the vertical direction of the pipeline centerline and completes the opening and closing of the valve by pressing the force-bearing part of the rocker arm 3 up and down. It is not affected by the flow direction of the medium and can be closed at any time according to the working conditions.

Swing check valve The check valve plays a role in restricting the reverse flow of the medium in the system, and has the function of cut-off isolation to protect the system and equipment; the manual device 8 rotates through the valve stem nut 28 to make the valve stem 5 move up and down, and the valve The rod 5 moves linearly along the vertical direction of the pipeline center line, the valve rod 5 lifts up, the valve can realize the normal swing check valve function, and the valve rod 5 moves downward to realize the forced closing of the valve. It is not affected by the flow direction of the medium and can be closed at any time according to the working conditions, so that the system can operate correctly. The valve adopts forging structure, which can refine the grain and optimize the performance of the material. The structure and performance of the forged material are better than that of the cast material, which improves the overall performance of the valve. Valve disc 4 and valve seat 2 are sealed with a 5° slope to ensure good sealing performance; there is an anti-rotation mechanism between valve disc 4 and rocker arm 3 to ensure that valve disc 4 will not rotate during use, thereby maintaining a stable seal sex. The connection between the manual device 8 and the swing check valve is through the bracket 7, the upper end of the bracket 7 is assembled with the manual device 8, the lower end is assembled with the valve cover 6, and the upper and lower ends are provided with a positioning stop 29 to ensure the concentricity of the valve stem 5 when it moves. An anti-rotation block is provided between the valve stem 5 and the bracket 7, and the valve stem 5 moves linearly up and down, which can improve the service life of the packing 9. Ensure zero leakage at 9 parts of packing, operate manual device 8 handwheel, move valve stem 5 up and down, loosen and compress rocker arm 3 and disc assembly to realize valve switch, so as not to be affected by medium flow direction according to working conditions , can be closed at any time to meet the standard sealing requirements.

The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Those skilled in the art make some simple modifications, equivalent changes or modifications by using the technical content disclosed above, all of which fall within the scope of the present invention. within the scope of protection of the invention.

Claims (9)

1. the swing check valve with operation device, including swing check valve, swing check valve includes valve body, valve seat, valve The rocking arm and the flap on rocking arm for rock shaft and the rock shaft rotation connection cover, being fixedly connected with the valve body, it is characterised in that： In the valve deck upper mounting bracket, the valve rod of operation device is threadedly coupled with the valve stem nut in operation device, valve rod lower end Stretch into the valve body of swing check valve；Operation device driving stem pushes the rocking arm in valve body.

2. the swing check valve with operation device according to claim 1, it is characterised in that：The upper and lower side of the stent is equal Equipped with positioning spigot.

3. the swing check valve with operation device according to claim 1, it is characterised in that：Set between the valve rod and stent There is anti-rotation block.

4. the swing check valve with operation device according to claim 1, it is characterised in that：The rocking arm back is set can The boss of the active force moved downward by the valve rod.

5. the swing check valve with operation device according to claim 4, it is characterised in that：The boss is convex for cambered surface Platform.

6. the swing check valve with operation device according to claim 1, it is characterised in that：The valve deck, which is equipped with, draws leakage Pipe and purge hole；Leak-off connection and purge hole are led on the outside of valve deck by the filler of valve rod and valve bonnet seal respectively.

7. the swing check valve with operation device according to claim 1, it is characterised in that：Between the rocking arm and flap Using anti-rotation structure.

8. the swing check valve with operation device according to claim 7, it is characterised in that：The anti-rotation structure is to shake Cast out on arm with valve flap contacts edge in boss insertion flap, the gap left between rocking arm and flap.

9. the swing check valve with operation device according to claim 1, it is characterised in that：The valve body and valve deck use Bolt flange structure with spirotallic gasket sealing, one of lip weldering is reserved in middle flange.