CN2727521Y

CN2727521Y - Actuator of pneumatic shut-off valve

Info

Publication number: CN2727521Y
Application number: CN 200420044883
Authority: CN
Inventors: 何先学
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-04-20
Filing date: 2004-04-20
Publication date: 2005-09-21
Anticipated expiration: 2014-04-20

Abstract

The utility model relates to a shut-off valve actuator, in particular to an actuator of pneumatic shut-off valve. The actuator of the utility model is installed on the valve body 21, and the valve cover 1 of the actuator and the valve body 7 which achieve the static seal by a membranes for valve; the pilot valve body 7 and the main cylinder 17 which achieve the static seal by a sealing rubber ring 8; the valve body and the main cylinder 17 which are achieve the static seal by a sealing cushion 9. The on-off of the valve depends on the switch of the pilot valve in the actuator to control the main piston 11 moving up-down in the main cylinder 17, which realizes open and close of the valve in the main piston 11 and valve body 21. By adopts the actuator, the height of the valve is reduced, the cost is reduced, the phenomenon of the leakage does not occur, the assembly of the factory and the maintenance of the user are convenient. The flowing medium in a pipe and the pressure signal medium which are controlled by the utility model is not only suitable for gas, and but also is suitable for the steam and liquid.

Description

A kind of actuator of pneumatic cut-off valve

The utility model relates to a kind of actuator of cut-off valve, especially a kind of actuator of pneumatic cut-off valve.

The present actuator of pneumatic cut-off valve on the market, not only its volume is very big, and cost of material almost accounts for half of whole cut-off valve cost of material, and processing and install very inconveniently, and cost is higher; The outer leakage problem of rushing down of valve is the problem that manufacturer and user are concerned about most always, it also is the problem that manufacturer has a headache most, owing to be sealed into motive sealing between the spool of actuator and the filler, there is the outer leakage phenomenon of rushing down to a certain degree in use for some time more or less herein, limited the using scope of valve because of rushing down the leakage problem outward simultaneously; User's maintenance is also very inconvenient, takes time and effort.

The purpose of this utility model provides a kind of actuator that overcomes a kind of cut-off valve of above deficiency, especially a kind of actuator of pneumatic cut-off valve.The present invention is installed in this actuator on the valve body, adopt static seal between valve body and this actuator, the break-make of valve is to control main piston by the switch of the pilot valve in this actuator to move up and down in master cylinder, thereby realizes the breakdown and the closure of the valve port in main piston and the valve body.After having adopted this actuator, the height of valve reduces greatly, and cost falls at the end greatly, has stopped outer generation of rushing down the leakage problem, and factory-assembled and user keep in repair very convenient quick.

Above-mentioned purpose of the present utility model is achieved in that this actuator includes guide's valve body, pilot valve core assembly, master cylinder, main piston assembly and Sealing; Design has air outlet flue (can be hole or flute profile) structure on the master cylinder, has an intake duct structure on the main piston assembly, and this intake duct design has filter screen; The mangetic core assembly of pilot valve moves around in the pilot valve body under the valve film is bullied the effect of governor pressure and Returnning spring, promoting on Sealing on the pilot valve core assembly and the master cylinder relief opening one closes from one, make the air outlet flue break-make repeatedly of master cylinder, main piston moves around in master cylinder because of the variation of pressure difference; Have sealing film and lubrication groove on the guide's spool of pilot valve core assembly and the main piston of main piston assembly, the effect of playing sealing and reducing friction; Valve gap and body guide valve body reach static seal by the valve film, and guide's valve body and master cylinder reach static seal by O-ring seal.

Adopt the solution case, it is big not only to have overcome the cut-off valve volume, the cost of production height, and the life-span is short, and the user uses and keeps in repair inconvenient phenomenon, face and overcome outer phenomenon of rushing down leakage.

Do further bright below in conjunction with the drawings and specific embodiments to the utility model:

Fig. 1 is the structural profile view of an embodiment of the present utility model;

Fig. 2 is the structural profile view of guide's valve body of the present utility model;

Fig. 3 is the structural profile view of pilot valve core assembly of the present utility model;

Fig. 4 is the structural profile view of main piston assembly of the present utility model;

Fig. 5 is the structural profile view of master cylinder of the present utility model.

Fig. 1, Fig. 2, Fig. 3, among Fig. 4 and Fig. 5, valve gap 1 is realized static seal with guide's valve body 7 by valve film 2, guide's valve body 7 is realized static seal with master cylinder 17 by O-ring seal 8, and master cylinder 17 is realized static seal with valve body 21 by sealing gasket 9, thereby has stopped the outer generation of rushing down leakage of valve effectively; Supporting plate 3 is fastened on guide's spool 4, has seal ring 5 and Sealing 10 on guide's spool 4, on it and be provided with a lubrication groove structure 18; Pressing plate 22 tightly is buckled in Sealing 10 on guide's spool 4 by screwing nut, and under the effect of spring 6, Sealing 10 has been sealed the relief opening 23 of master cylinder 17; One air chamber 20 is arranged between master cylinder 17 and the guide's valve body 7, and the passage 19 on itself and the master cylinder 17 forms air outlet flues; Have O-ring seal 15 and sealing gasket 12 on the main piston 11, on it and be provided with a lubrication groove structure 26, crimp 14 is pressed on sealing gasket 12 on the main piston 11 by nut 25, has filter screen 13 on the intake duct 24 on the crimp 14; Under the effect of spring 16, the sealing gasket 12 on the main piston 11 is pressed on the valve port of valve body 21.

Working principle of the present utility model is: when needs breakdown valve, give certain control air pressure on valve film 2 by the port hole on the valve gap 1, valve film 2 overcomes the suffered frictional force of the elastic force of spring 6 and guide's spool 4 under the effect of control air pressure, promoting supporting plate 3 moves down, thereby make and produced certain interval between the relief opening 23 of Sealing 10 on guide's spool 4 and master cylinder 17, master cylinder 17 inner high voltage gases are rapidly by air outlet flue 19, main piston 11 overcomes the elastic force of spring 16 and suffered frictional force thereof under the effect of pipeline pressure, produce in moment under the effect of very big pressure reduction, main piston 11 is rapidly to moving, the speed away valve port of valve body of Sealing 12 has been realized the valve breakdown; When the needs throttle down, discharge control air pressure earlier, guide's spool 4 moves on rapid under the effect of the elastic force of spring 6, make 10 moments of Sealing close the air outlet flue of master cylinder 17, at this moment be full of pressurized gas in the master cylinder immediately, main piston 11 moves down rapidly under the effect of the elastic force of spring 16, the valve port of Sealing 12 rapid valve body 21.

There is multiple structure exhaust passage of the present utility model, have integrated type (being that the exhaust passage is only on the main piston) and split type (be the exhaust passage not only on main piston some, on other component that are mated also some), passage can be straight-through along the main piston wall, also can come out from main piston wall side, the variation of these structures all belongs to scope of the present invention; This specification is described only to be a kind of of above-mentioned variation; Channel flow moving medium and pressure signal medium that the utility model is controlled not only are suitable for gas, also are suitable for steam and liquid.

Claims

1. the actuator of a pneumatic cut-off valve, mainly form by valve gap, pilot valve core assembly, master cylinder, main piston assembly, spring, O-ring seal and sealing gasket etc., it is characterized in that: between master cylinder (17) and the main piston (11) spring (16) is arranged, design has intake duct (24) on the main piston assembly, and this intake duct (24) is gone up design filter screen (13); Sealing on the pilot valve core assembly (10) cooperates with relief opening (23) on the master cylinder (17), between pallet (3) and the guide's valve body (7) spring (6) is arranged.

2. according to the actuator of claim 1 described pneumatic cut-off valve, it is characterized in that: this master cylinder (17) is gone up design exhaust passage (19) and relief opening (23).

3. according to the actuator of claim 1 described pneumatic cut-off valve, it is characterized in that: the guide's spool (4) of this pilot valve core assembly and the main piston (11) of main piston assembly have lubrication groove (18) and lubrication groove (26) respectively.