CN2547977Y

CN2547977Y - Full-closed combined non-return valve

Info

Publication number: CN2547977Y
Application number: CN 01280017
Authority: CN
Inventors: 何宝愚
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-12-30
Filing date: 2001-12-30
Publication date: 2003-04-30
Anticipated expiration: 2011-12-30

Abstract

The utility model provides a multifunctional fully-closed combined non-return valve, which comprises a front non-return valve, a rear non-return valve and a steerable non-return valve meter terminal and is characterized in that the front valve body is provided with a piston, a spring (21) is arranged in the piston, a Teflon seal ring (23) and a tailor-made rubber ring (24) are arranged at one end of the piston and compressed by a valve needle (25), an enclosure is arranged at the outer valve port and the steerable non-return valve meter terminal is arranged at the upper end of the front valve body. The utility model is characterized in that the rear cut-off valve body is provided with pistons which comprises an upper piston (4) and a lower piston (8), the two pistons are provided with steel balls (5), the connection of the two pistons are located by a fixed bolt (9), the lower piston does not rotate while working by using the steel balls so as to prevent abrasion, the upper piston is provided with two cushion rubbers (6-7) at the lower end and is provided with a square rod at the top end, Teflon seal rings (11) and tailor-made rubber rings (10) are arranged at the lower end of the upper piston and are compressed with washers (12) and bolts (13) and the pistons are in thread connection with the valve body. When a hand wheel rotates an upper piston rod, the pistons are moved up and down in the valve bodies to realize sealing and opening.

Description

All-closed combined check valve

Affiliated technical field

The utility model relates to the valving of conducting of a kind of sulphur hexafloride circuit breaker gas and air protection, and especially it is the all-closed combined check valve that can realize twice protection and instrument monitoring device on a valve body simultaneously to sulfur hexafluoride gas.This valve is that front end is special stop valve, and the rear end is a check valve, and the upper end is the full enclosed type combinaing valve body of instrument cut-off joint device, because two valves work simultaneously, the protection of sulfur hexafluoride gas is strengthened, and makes the switch can safe operation.

Background technique

The gas valve structure of present sulphur hexafloride circuit breaker, mostly be jointing type, promptly by 2 stop valves, transition joint body and meter connector are formed by connecting, whole valve body is formed millimeters long more than 300, body weight is at the 5-6 kilogram, because many, the body weight of tie point adds that sealed valve core is single sealing chip, cause the valve long operational time, distortion and seepage phenomenon constantly take place, and need artificial long-time monitoring, check, bring hidden danger for the safe operation of product.And not attractive in appearance, cost is high, a cover inlet valve adds national accessory, needs about 4000 yuan.The weight of the all-closed combined check valve of the utility model only is 1/5 of former valve, and cost is 1/4 of a former valve.

Summary of the invention

In order to overcome the existing deficiency of disjunctor valve; the utility model provides a kind of all-closed combined check valve; this valve can be equipped with stop valve on same valve body; but check valve and steering-type check meter connector; and piston valve core is installed in checking-valve body; on it divides; lower piston; in two-piston, be equipped with steel ball; be equipped with two road cushion rubbers at the upper piston middle part; be equipped with poly-tetrafluoro seal ring and special Ethylene Propylene Terpolymer cushion rubber in the lower piston bottom; the outlet of valve body upper end is equipped with sealing cover; in check valve case, be equipped with piston; be equipped with spring and spring seat in the piston, be equipped with poly-tetrafluoro seal ring and special Ethylene Propylene Terpolymer cushion rubber, but be equipped with steering-type check meter connector in the check valve case upper end in piston nose; when switch in when operation; the stop valve of combination brake switch and proporting and check valve can be worked simultaneously, make the switch sulfur hexafluoride gas obtain the two seals protection simultaneously, reach the switch purpose of safe operation; and, reduce cost 1/4 than original product weight reduction 1/5.

The technical problem that solves

Technology of the present utility model is to realize like this, it comprises former and later two valve bodies, promptly in preceding check valve case, piston is installed, in piston, be equipped with spring seat, in piston nose poly-tetrafluoro seal ring and special cushion rubber are installed, fix with needle, piston is under spring and gas reaction, make special cushion rubber pressing, subsequently by poly-tetrafluoro seal ring pressing, make valve port reach the secondary sealing simultaneously, in the check valve case upper end steering-type check valve meter connector is installed, it divides valve body up and down, in two valve bodies needle is installed, and the needle upper end is equipped with cushion rubber, the needle lower end is equipped with spring, needle promotes lower seal at spring and lives in valve port, during the work of band table, depresses needle by the screw socket place, the end that shows, make the gas in the check valve enter pressure gauge, the direction of table is rotatable, when valve body need charge and discharge gas, sealing cover is taken down, set up charging and discharging joint, open check valve piston needle by joint, and back stop valve piston is opened, charge and discharge gas, take off after charging and charge and discharge joint, it is self-styled to reach check valve, and first-class then sealing cover reaches totally-enclosed work.In the checking-valve body of back, upper piston and lower piston are installed, in two-piston, be equipped with steel ball, purpose is lower piston not to be rotated guarantee that seal is not frayed when pressurized, be equipped with two road O-ring seals in the upper piston bottom, in the lower piston bottom special cushion rubber and poly-tetrafluoro seal ring are installed, fix with packing ring and round head bolt, the two-piston connection is fixed up under rotating situation by set screw, when proper functioning, open sealing cover, with preceding check valve case sealing cover, be with cubic hole in it, dual-purpose for the handwheel sealing cover, it is gone up in the checking-valve body of back on the piston rod, gas is entered in two valve bodies, take off dual-purpose sealing cover then, first-class two valve body sealing covers make whole combination brake switch and proporting be in full closeding state.Before and after the connection of valve body get up by two road cushion rubbers and four screw, the utility model valve volume is little, in light weight, aesthetic in appearance, in addition owing to adopt valve port double-sealing and piston valve core, valve was worked at low temperatures or also can not change by the foreign impacts sealability, and still can reach reliable and stable purpose.

Beneficial effect

1, adopt stop valve and check valve directly to make up, save the transition joint body, make total combination brake switch and proporting shorten 1/2, weight reduces 4/5, has avoided the valve body distortion to leak, and cost also descends 3/4 simultaneously.

2, stop valve adopts the plunger type piston valve core, and outlet all has the two seals circle up and down, and is equipped with seal closure at last valve port sealability is improved greatly, has eliminated the deficiency of easy to crack, yielding, the easy leakage of expansion tube screw type valve.

3, adopt multi-functional check valve case, be that the check valve meter connector is structure as a whole, intermediate seal adopts piston valve core, be equipped with two road seal rings before the piston, one cushion rubber, together poly-tetrafluoro, be equipped with spring in the piston, the piston of valve can be worked under the 20mpa normal pressure, and can be high pressure resistant, low temperature resistant, sealability is reliable and stable.

Description of drawings

Embodiment further specifies the utility model below in conjunction with accompanying drawing.

The sectional structure chart of the enforcement system example of accompanying drawing 1 all-closed combined check valve.

Accompanying drawing 2 is back checking-valve body (2) K1-K1 mounting flange sectional views of accompanying drawing 1.

Accompanying drawing 3 is piston apparatus structure sectional views in the checking-valve body behind the all-closed combined check valve of accompanying drawing 1.

Fig. 4 is the piston apparatus structure sectional view in the preceding check valve case of the all-closed combined check valve of accompanying drawing 1.

Among the figure 1, checking-valve body 2, seal closure 3, cushion rubber 4, upper piston 5, steel ball 6, cushion rubber 7, cushion rubber 8, lower piston 9, set screw 10, special cushion rubber 11, poly-tetrafluoro seal ring 12, packing ring 13, screw 14, cushion rubber 15, cushion rubber 16, cushion rubber 17, cushion rubber 18, screw 19, check valve case 20, spring seat 21, spring seat 22, piston 23, poly-tetrafluoro seal ring 24, special cushion rubber 25, needle 26, sealing cover 27, cushion rubber 28, spring seat 29, spring 30, following check meter connector 31, last meter connector body 32, seal 33, needle 34, cushion rubber 35, steel ball 36, cushion rubber 37, cushion rubber 38, mounting flange

Embodiment

Among Fig. 1, checking-valve body (1) is equipped with upper piston (4) and lower piston (8) and is equipped with steel ball (5) upper piston top is processed as cubic type in two-piston in valve body, the lower end is equipped with cushion rubber (6), cushion rubber (7) is fixed with packing ring (12) and screw (13) at the poly-ptfe ring (11) that the lower piston bottom is equipped with special cushion rubber (10), last lower piston is fixed on the pivotal position by set screw (9), when moving, the needs product, has cushion rubber (3) on the sealing cover with first-class the sealing of seal closure (27).

Among Fig. 1, check valve case (19) is equipped with piston (22) and spring (23) is installed in piston fixes with needle (25) in check valve case, when product normally moves, sealing cover (26) is lived jam pot cover, have cushion rubber (27) on the sealing cover but be equipped with steering-type check table valve in check valve case upper end, joint divides valve body (30) under the upper valve body (31), needle (33) cushion rubber (32) spring (29) spring seat (28) is installed in two valve bodies, cushion rubber (37) is installed in the lower valve base bottom, and to be equipped with cushion rubber (34) steel ball (35) steel ball in upper valve base and lower valve base connection be spacing usefulness being equipped with cushion rubber (36) with last valve connection, and the position that can drive the upper valve body stem is used.

In checking-valve body and check valve case joint, O-ring seal (16) and (17) are installed fix with screw (18), at checking-valve body and product joint cushion rubber (14) and (15) are installed.

Fig. 2 is stop valve two ends mounting flanges (38)

Fig. 1, all-closed combined check valve are when proper functioning, and the stop valve piston is open in usual, and the check valve piston is a Normally closed type, and the check meter connector is open in usual, when needing the maintenance check valve case stop valve are closed dead.

Claims

1, a kind of all-closed combined check valve, check valve case and back checking-valve body before it divides, two valve bodies are connected with screw by O-ring seal, it is characterized in that being equipped with in the front valve shell piston, piston nose is equipped with two road seal rings, together poly-tetrafluoro, together special cushion rubber packing ring and screw, be equipped with spring in the piston, spring seat.

2, all-closed combined check valve according to claim 1, it is characterized in that: preceding check valve case upper end, but steering-type check valve meter connector is installed, and meter connector divides valve body up and down, in two valve bodies needle is installed, the needle upper end is equipped with cushion rubber, the needle lower end is equipped with spring, spring seat, and following valve body bottom is equipped with cushion rubber, top and upper valve body joint are equipped with cushion rubber, and upper valve body is equipped with cushion rubber and steel ball.

3, all-closed combined check valve according to claim 1 is characterized in that: in the checking-valve body of back piston is installed, it can divide upper piston and lower piston, is equipped with steel ball in two-piston.The upper piston bottom is equipped with two road cushion rubbers, and there is cubic bar the upper end, in the lower piston bottom two road seal rings is installed, together poly-tetrafluoro, and one special cushion rubber is by packing ring and screw.

4, all-closed combined check valve according to claim 1 is characterized in that: two valve outlet places, front and back are equipped with sealing cover, are equipped with cushion rubber on the sealing cover.