CN2365467Y

CN2365467Y - High reliable and durable release valve

Info

Publication number: CN2365467Y
Application number: CN 99231202
Authority: CN
Inventors: 王元清; 王元义
Original assignee: CHANGJIANG INSTRUMENT FACTORY LESHAN
Current assignee: CHANGJIANG INSTRUMENT FACTORY LESHAN
Priority date: 1999-03-20
Filing date: 1999-03-20
Publication date: 2000-02-23
Anticipated expiration: 2009-03-20

Abstract

The utility model provides an emptying valve with high reliability and a long service life, which is mainly composed of a valve body (2), a valve rod (7), a valve cover (10), a valve core (6), a valve seat (4), a cage-shaped valve sleeve (5), a sealing rubber ring (3), etc. The utility model is characterized in that the grooving position of the cage-shaped valve sleeve is simultaneously provided with an emptying throttling hole; the valve core, the middle part of which is provided with a balance hole (16), has a plunger piston-shaped structure, and the valve core and the valve seat form a hard sealing pair; the valve core, the valve seat, a convex ring or an O-shaped ring form a soft sealing pair. As a result, the hard and soft sealing pairs with double-quality are realized, the high reliability and the service life of valve sealing are raised, and the operating requirements of high technology parameters for different flow rates, pressure, etc. are satisfied. The utility model can be suitable for being used for emptying and stopping collecting and conveying devices of oil and gas pipe lines.

Description

The high reliability long life atmospheric valve

The utility model belongs to the valve class, a kind of high reliability long life atmospheric valve that is applicable on pipe-line or the device.

Existing petrochemical pipe and device are gone up the atmospheric valve that uses and are all adopted general stop valve or gate valve to make atmospheric valve.Their throttling positions when emptying just in time are the sealing part of spool or valve seat, and chock pressure difference is big during emptying, and solid particle in the fluid and gas medium are paid sealing and washed away greatly, easily cause damage.The claimant in 92 years a kind of atmospheric valves (ZL92223823.5) in first to file though throttleng surface and sealing surface are separated, avoided directly washing away of medium, but the hard sealing of spool and valve seat is paid and is the inclined-plane, soft seal is paid on the cylndrical surface that is attached to spool, the O shape circle that soft seal was paid when emptying pressure reduction was excessive is fragile, pull, thereby reliability is relatively poor.

The purpose of this utility model is the defective that overcomes the design of above-mentioned atmospheric valve, improves the sealing of valve, strengthens soft seal and pays stretching resistance, improves the reliability that double-sealing is paid, and prolongs atmospheric valve working life.

The purpose of this utility model reaches by following high reliability long life atmospheric valve design proposal.It is mainly by valve body, is arranged on valve rod, cage type valve pocket and valve seat in the valve body, with compositions such as the supporting spool of valve seat, O-ring seals.The fluting place that it is characterized in that the cage type valve pocket also is the emptying throttle orifice simultaneously; Spool is a plunger shape structure, and its middle part has equalizing orifice, make spool the cage type valve sleeving inner wall is upper and lower move in stress balance; Spool, valve seat, cage type valve pocket, O-ring seal are formed hard soft pair of matter sealing and are paid, and it can have following three kinds of forms of implementation, to adapt to the requirement that sealing is paid to atmospheric valve of different latus rectums and pressure rank:

1. the spool bottom end is paid with the hard sealing of valve seat end face composition.

2. the spool bottom end is paid with the oblique annular groove of cage type valve pocket, the oblique annular groove of valve seat, the soft seal of O shape cushion rubber composition.

3. the spool bottom end is formed soft seal and is paid with the tiltedly straight annular groove of cage type valve pocket, the tiltedly straight annular groove of valve seat, convex cushion rubber.Its camber cushion rubber is a kind of special cushion rubber of up-small and down-big cucurbit sample that is embedded in the tiltedly straight annular groove of cage type valve pocket.

In addition, at be nested annular groove to the cage type valve pocket fluting place of O-ring seal (O shape circle or convex circle) of cage type valve one section slow distance of pressing is arranged, the size of this distance is according to forming slow requirement design of pressing, and makes lift off a seat upper-end surface and can form sealing during near valve pocket fluting place and delay pressure of spool bottom end.

Fig. 1 is the utility model structural representation and embodiment

Fig. 2 closes, delays the schematic representation under pressure, throttling, four kinds of states of standard-sized sheet for this atmospheric valve

Fig. 3 is the A enlarged view of Fig. 2, and 3-1 is that O shape cushion rubber is set, and 3-2 sets for the convex cushion rubber

1. the 4. tiltedly straight annular groove of tiltedly straight oblique annular groove 23. valve seats of annular groove 22. valve seats of the oblique annular groove 21. cage type valve pockets of valve seat 5. cage type valve pocket 6. spools, 7. valve rod 8. steel balls, 9. pump nozzle 10. valve gaps, 11. seal pressure cap 12. supports, 13. swivel nut 14. handles, 15. filler 16. equalizing orifices, the 17. cage type valve pocket fluting 18.O of place shape cushion rubber 19. convex cushion rubbers, 20. cage type valve pockets of lower cover 2. valve bodies 3. O-ring seals (O forms convex)

In the present embodiment, 10 of seal pressure cap 11, steel ball 8 and valve rod 7 and valve gaps are housed on the spool 6 stuffing box packing is housed, spool bottom end and valve seat end face form with hard alloy overlay welding, for guaranteeing the sealing of valve rod place, seal gease pump nozzle 9 is housed on the valve rod, 2 of valve gap 10 and valve pocket 5, valve bodies are with O shape rubber sealing, adopt scyewed joint between valve rod and the swivel nut 13, swivel nut is installed on the support 12, selects for use O shape cushion rubber and convex cushion rubber to form secondary seal according to the difference of latus rectum, pressure in the tiltedly straight annular groove of valve seat.Because spool is plunger shape structure, area equates up and down, offer equalizing orifice 16 in the middle after, valve opening or when closing compression area identical, so open and close flexibly, only need the additional seal specific pressure just can realize zero leakage when closing.Be further described below in conjunction with 2 pairs of the utility model of accompanying drawing.1. closed condition.Spool 6 is in the G position, and its hard sealing is paid on the end face that end face is pressed on valve seat 4 and formed one hard sealing.Convex circle or O shape circle is close to and forms the soft sealing in second road on the spool bottom end simultaneously.

2. slow pressure condition.Spool is in the H position, and at the spool sealing surface of lifting off a seat, bottom end is during again near cage type valve pocket and fluting place, and the spool external diameter forms sealing with cage type valve pocket internal diameter, and this moment, medium did not have direct emptying pressure release, played slow pressure effect.

3. throttle.Spool is in the J position, and the high-velocity fluid during emptying directly washes away fluting place 17 after slow the pressure, thereby the valve base sealing of bottom, fluting place is paid and avoided directly washing away of medium.Though high-velocity fluid forms powerful eddy current at the soft seal place of paying, because it is to select for use O shape cushion rubber and convex cushion rubber to be embedded in the oblique annular groove or tiltedly straight annular groove of cage type valve pocket, so soft sealing material can not pulled, damage respectively according to the difference of latus rectum pressure that soft seal is paid.In the soft seal regime of elastic deformation, adjust physical dimension, hard soft pair of matter sealing is paid satisfy various working state requirements.

4. full-gear.Emptying this moment is in the intermediary and later stages, pressure reduces, and spool is in the C position, and fluid resistance in valve is less, has shortened emptying time, has improved the emptying effect.

The utility model has the advantages that throttling position and sealing position are separated, spool, valve seat adopt hard, soft pair of matter sealing to pay, improved sealing, and spool is offered equalizing orifice makes open and close torque little, thereby open flexibly, and the unique texture of convex cushion rubber has solved soft seal and pays stretching resistance not strong difficult point, thereby improved the reliability that double-sealing is paid, and improved the usage requirement of atmospheric valve technical parameters such as flow, pressure, prolonged working life.

Claims

1. high reliability long life atmospheric valve, mainly by valve body (2), be arranged on the valve rod (7) in the valve body, cage type valve pocket (5) valve seat (4) and with supporting spool (6) O-ring seal (3) composition of etc.ing of valve seat, it is characterized in that the fluting place (17) of cage type valve pocket also is the emptying throttle orifice while; Spool is a plunger shape structure, and its middle part has equalizing orifice (16); Forming hard, soft pair of matter sealing by spool, valve seat, cage type valve pocket and O-ring seal pays.

2. according to the described high reliability long life atmospheric valve of claim 1, its feature is that also described pair of matter sealing pay following three kinds of forms of implementation can be arranged:

1. the spool bottom end is formed hard sealing with the valve seat end face and is paid;

2. the spool bottom end is with the oblique annular groove of cage type valve pocket (20), and the oblique annular groove of valve seat (22), O shape cushion rubber (18) are formed soft seal and paid;

3. the spool bottom is with the tiltedly straight annular groove (21) of cage type valve pocket, and the tiltedly straight annular groove (23) of valve seat, convex cushion rubber (19) are formed soft seal and paid.

3. according to claim 1 or 2 described high reliability long life atmospheric valves, its feature is that also described convex cushion rubber structure is up-small and down-big cucurbit sample cushion rubber.

4. according to the described high reliability long life atmospheric valve of claim 1, its feature is that also there is one section slow distance of pressing at cage type valve O-ring seal annular groove to the cage type valve pocket fluting place (17) that is nested, the size of this distance is pressed into slow requirement design according to shape, makes lift off a seat end face and can form sealing during near valve pocket fluting place and delay pressure of spool bottom end.