CN201526692U - Pneumatic welded-type high temperature resistant bellows gate valve - Google Patents

Abstract

The utility model discloses a pneumatic welded-type high temperature resistant bellows gate valve, and relates to a gate valve which comprises a welded-type valve body, wherein a pneumatic head device is mechanically connected with a pneumatic head device frame; the pneumatic head device frame and a valve deck are mechanically connected by a bolt, a spring washer and a nut; a pneumatic head core shaft and the upper part of the valve rod are mechanically connected with a pneumatic head core shaft sleeve by transverse bolts; the welded-type valve body is bead-welded with a Co based hard alloy seal ring; a titanizing austenitic stainless steel bellows device is movably and mechanically connected between the lower part of the valve rod and the upper part of a gate; and the lower part head of the valve rod is movably and mechanically connected with the gate to lead the valve rod lifting rod to drive the titanizing austenitic stainless steel bellows device to go up and down. The gate valve has simple structure and convenient installation, the pneumatic head can be used on automatically controlled pipelines, the dual sturdy and durable bellows has convenient dismounting, and the seal design of the bellows ensures zero leakage of the valve rod.

Description

A kind of pneumatic gate valve for welding type high-temperature resistant bellows

Technical field:

The utility model relates to a kind of pneumatic gate valve.

Background technique:

At present, known gate valve, the open-shut device with gate valve are the flashboards of plug type, and sealing surface is the plane or the conical surface, the center line moving linearly of flashboard longshore current body.The movement pattern of valve rod has elevating lever-type.Gate valve only is applicable to standard-sized sheet and complete shut-down, does not allow to do to regulate and throttling.Belong to forced seal formula valve,, do not leak with forced seal face so when valve closing, must exert pressure to flashboard.When medium enters valve by the flashboard below, the required resistance that overcomes of steering force is the frictional force of valve rod and filler with by the thrust that pressure produced of medium, the power that the force rate of closing valve is opened valve is big, so it is big that the diameter of valve rod is wanted, otherwise the fault of valve rod bending can take place.In recent years, after occurring from self-packing valve, the MEDIA FLOW of gate valve enters valve pocket to just changing by the flashboard top, and at this moment, under the pressure medium effect, the power of closing valve is little, and it is big to open the power of valve, and the diameter of valve rod can correspondingly reduce.Simultaneously, under the medium effect, the valve of this pattern is also tighter.When gate valve was opened, the Lift of flashboard was 25% of nominal diameter～30% o'clock, and it is maximum that flow has reached, and the expression valve has reached fully open position.So the fully open position of gate valve should be decided by the stroke of flashboard.

The model utility content:

In order to solve gate valve forced seal formula valve, when valve closing, must exert pressure to flashboard, with the technical problem that forced seal face does not leak, the utility model provides a kind of pneumatic gate valve for welding type high-temperature resistant bellows.

Technological scheme: a kind of pneumatic gate valve for welding type high-temperature resistant bellows, comprise the welding type valve body, it is characterized in that pneumatic head unit and pneumatic head unit frame mechanical connection, pneumatic head unit frame and valve gap are by bolt, compression spring, the nut mechanical connection, pneumatic mandrel and valve rod top and pneumatic core sleeve are by horizontal bolt mechanical connection, built-up welding Co base cemented carbide seal ring on the welding type valve body, the active mechanical connection of titanizing Austenitic Stainless Steel bellows arrangement is below the valve rod and between above the flashboard, the active mechanical connection of square toes and flashboard under the valve rod, make the valve rod lifting bar drive the lifting of titanizing Austenitic Stainless Steel bellows arrangement, the welding type valve body contacts the convex-concave place and is embedded with bolt spring pad nut mechanical connection by high temperature resistant pad with valve gap, put down in the stuffing box on the valve gap Packing seat filler by Gland with the jack screw on the valve gap by very heavy nut mechanical connection.

Technique effect: owing to adopt such scheme, simple in structure, easy for installation, pneumatic head can use on the pipeline of automation control, be welded to connect convenient disassembly, dual robust bellows convenient disassembly, product structure is reasonable, sealing is reliable, dual robust sylphon seal design guarantees the zero leakage of valve rod.Do not have fluid loss, reduce energy loss, improve safety of factory equipment.Sealing surface weld deposit Co base cemented carbide, wear-resisting, corrosion resistant, good, the long service life of friction resistant performance, bellows titanizing Austenitic Stainless Steel is wear-resisting, corrosion resistant, good, the long service life of friction resistant performance, modified and the surfaces nitrided processing of valve rod has good anti-corruption and friction resistant performance; The indication of valve rod lifting position, more directly perceived, be applicable on the pipeline of various operating modes such as oil, chemical industry, pharmacy, chemical fertilizer, power industry, cut off or connect the pipeline medium.On conduction oil snail boiler tube road engineering, use especially.

Description of drawings:

Fig. 1 is the utility model embodiment's a schematic representation.

Embodiment:

Below in conjunction with drawings and Examples the utility model is further specified.

In the drawings: 1. welding type valve body, 2. built-up welding Co base cemented carbide seal ring, 3. titanizing Austenitic Stainless Steel bellows arrangement, 4. valve rod, 5. high temperature resistant pad, 6. bolt, 7. compression spring, 8. nut, 9. jack screw, 10. very heavy nut, 11. valve gaps, 12. pneumatic core sleeves, 13. horizontal bolt, 14. Glands, 15. fillers, 16. times Packing seats, 17. pneumatic head unit, 18. pneumatic head unit framves, 19. bolts, 20. compression springs, 21. nut, 22. pneumatic mandrels, 23. flashboards.

In example shown in Figure 1: pneumatic head unit 17 and pneumatic head unit frame 18 mechanical connections, pneumatic head unit frame 18 and valve gap 11 are by bolt 19, compression spring 20, nut 21 mechanical connections, pneumatic mandrel 22 and valve rod 4 tops and pneumatic core sleeve 12 are by horizontal bolt 13 mechanical connections, built-up welding Co base cemented carbide seal ring 2 on the welding type valve body 1, titanizing Austenitic Stainless Steel bellows arrangement 3 active mechanical connections are below the valve rod 4 and between above the flashboard 23,4 times square toes of valve rod and flashboard 23 active mechanical connections, make the valve rod lifting bar drive the lifting of titanizing Austenitic Stainless Steel bellows arrangement, welding type valve body 1 contacts the convex-concave place and is embedded with bolts 6 compression springs 7 nuts 8 mechanical connections by high temperature resistant pad 5 with valve gap 11, put down in the stuffing box on the valve gap 11 Packing seat 16 filler 15 by the jack screw 9 on the Gland 14 usefulness valve gaps 11 by very heavy nut 10 mechanical connections.Pneumatic head can use on the pipeline of automation control, is welded to connect convenient disassembly, dual robust bellows convenient disassembly, and product structure is reasonable, sealing is reliable, and dual robust sylphon seal design guarantees the zero leakage of valve rod.

Claims (3)

1. pneumatic gate valve for welding type high-temperature resistant bellows, comprise the welding type valve body, it is characterized in that pneumatic head unit and pneumatic head unit frame mechanical connection, pneumatic head unit frame and valve gap are by bolt, compression spring, nut mechanical connection, pneumatic mandrel and valve rod top and pneumatic core sleeve are by horizontal bolt mechanical connection, built-up welding Co base cemented carbide seal ring on the welding type valve body, the active mechanical connection of titanizing Austenitic Stainless Steel bellows arrangement is below the valve rod and between above the flashboard, the active mechanical connection of square toes and flashboard under the valve rod.

2. according to claims 1 described a kind of pneumatic gate valve for welding type high-temperature resistant bellows, comprise the welding type valve body, it is characterized in that making the valve rod lifting bar to drive the lifting of titanizing Austenitic Stainless Steel bellows arrangement, the welding type valve body contacts the convex-concave place and is embedded with bolt spring pad nut mechanical connection by high temperature resistant pad with valve gap.

3. according to claims 1 described a kind of pneumatic gate valve for welding type high-temperature resistant bellows, comprise the welding type valve body, it is characterized in that putting down in the stuffing box on the valve gap Packing seat filler by Gland with the jack screw on the valve gap by very heavy nut mechanical connection.