CN201184434Y

CN201184434Y - Monomer axial flow type back valve with sealing ring arranged at front

Info

Publication number: CN201184434Y
Application number: CNU2007200808150U
Authority: CN
Inventors: 邹定勇
Original assignee: ZIGONG NDIV DIPPER VALVE CO Ltd
Current assignee: ZIGONG NDIV DIPPER VALVE CO Ltd
Priority date: 2007-08-24
Filing date: 2007-08-24
Publication date: 2009-01-21
Anticipated expiration: 2017-08-24

Abstract

The utility model discloses a single-body axial-flow type check valve with a front packing ring, which comprises a valve housing, a valve body, a valve flap component, a valve shaft, a packing ring, a retainer ring, a front fulcrum bearing as well as a rear fulcrum bearing, a spring, etc. The valve housing and the valve body are integrated as a whole; the packing ring is arranged at an upper port of the valve body; a convex type retainer ring is arranged in front of the packing ring; a fixed pin is arranged between the packing ring and the convex type retainer ring; zero leakage between the packing ring and the valve body can be realized by utilizing an O-shaped ring, thereby leading the single-body axial-flow check valve with large caliber and overlarge caliber to be realized on the processing technique, simplifying the technique, increasing the precision, and optimizing the performance; by adopting the single-body structure, the leakage point toward the atmosphere does not exist.

Description

The pre-installed monomer axial flow type check valve of seal ring

Technical field

The utility model relates to axial flow type check valve, relates in particular to a kind of heavy caliber, the pre-installed monomer axial flow type check valve of super large caliber seal ring.

Background technique

In the running of various pumping pipes, how to prevent the refluence of medium, and prevent that valve leak from being a considerable problem.Traditional safety check (as: Swing check valve, Lift check valve and other safety check etc.) housing is made up of several parts, therefore has the source of leaks to the valve external leaks; Because being the pressure and the flap self gravitation of dependence medium back flow, traditional safety check anti-back flow principle is used for realizing that therefore when pressure medium was low, traditional safety check was difficult to the sealing of realization to reflux medium.The pressure spring that is provided with between the flap of axial flow type check valve and the valve pocket, closing for the axial flow type check valve flap provides a spring force, even pressure medium is very little, the spring force of pressure spring can guarantee that also flap and sealing surface of seat form enough seal pressures, prevents that medium from flowing backwards.Because the valve body of axial flow type check valve is as a whole, so there is not outside source of leaks in valve itself.But when the axial flow type check valve bore is very big,, just there be N-1 leakage point, increased the possibility of valve leak undoubtedly to atmosphere for N body formula structure because the sealing that divides body structure to guarantee flap and valve seat is often adopted in the restriction of processing conditions; Guarantee the sealability of axial flow type check valve, must guarantee that also flap and sealing surface of seat are good to neutrality, divide the body structure existence bigger fit up gap, can not guarantee fully flap and valve seat to neutrality; Sealing surface of seat is on valve body, and this causes certain difficulty also for processing and maintenance, thereby the sealing effect that not only influences valve also influences the working life of valve.

The model utility content

The purpose of this utility model is, at the deficiency in the above-mentioned background technology, by improving the structure of axial flow type check valve, provide a kind of seal ring pre-installed monomer axial flow type check valve, solved the limited problem of monomer axial flow type check valve bore, overcome and to have adopted the multi-hull type structure before heavy caliber and the super large caliber axial flow type check valve and always exist to the leakage point of atmosphere and sealing surface of seat processing, shortcoming difficult in maintenance, to reach processing, easy to assembly, valve seal is effective, the purpose of long service life.

The utility model comprises valve pocket 1, valve body 2, " O " type circle 3 between flap and the valve shaft, convex back-up ring 5 before " O " type circle 4 between seal ring and the valve body, seal ring, the locating pin 6 between seal ring and the convex back-up ring,

locking nut

7,15,18, front lining 8, preceding supporting 9, seal ring 10, socket head screw 11, flap pressure ring 12, flap seal ring 13, flap 14, valve shaft 16, back bush 17, spring 19, back-up ring fixed groove 20, positioning hole 21,24, sealing surface of seat 22, " O " type ring recess 23, three blockings 25,26,27 of convex back-up ring.

The beneficial effects of the utility model are:

1, valve pocket and valve body are as a whole, have avoided forming the possibility that causes to the valve external leaks because of valve body by several sections, have fundamentally stopped leaking outside of valve.

2, valve seat and valve body are separate, and sealing surface of seat constitutes seal ring jointly with valve seat on valve seat.Because valve seat has separated to come out from valve body, structure length is shorter, and the outer diameter is less, therefore can reduce the process equipment grade, improves the machining accuracy of sealing surface of seat, guarantees the sealability of valve.The bore of the front lining of valve shaft is far smaller than the valve body bore, therefore guaranteed with the coaxality of valve shaft back bush and flap and sealing surface of seat to neutrality, thereby guaranteed the sealability of flap and sealing surface of seat.

3, the setting of convex back-up ring has guaranteed that seal ring can be axially to left dislocation when bearing flap and close power or medium back flow thrust.

4, seal ring can be for convenience detach, in the violent operating mode of sealing surface wear, is convenient to the maintenance of sealing surface or the replacing of seal ring; Sealing surface does not damage the back sealing surface situation that whole valve is just scrapped difficult in maintenance before not existing, and has prolonged the working life of valve.

5, utilize " O " type circle to realize zero leakage sealing between seal ring and the housing, guaranteed valve integral body static or dynamically under sealing effect.

Description of drawings

Fig. 1: the pre-installed one-body shaft streaming of seal ring check valve structure figure

The partial view of Fig. 2: Fig. 1

Fig. 3: valve body sectional drawing

Fig. 4: valve A is to view

Fig. 5: pre-installed seal ring plan view

Fig. 6: pre-installed seal ring A-A sectional drawing

Fig. 7: convex back-up ring plan view

Fig. 8: convex back-up ring sectional drawing

Embodiment

With reference to Fig. 1,2,3,4: valve body 2 is an overall structure, and valve pocket 1 is positioned at valve inner, and valve pocket and valve body are parts; The flap assembly is made of flap 14, flap seal ring 13, flap pressure ring 12 and relevant connection fastening piece; The flap seal ring is arranged between flap and the flap pressure ring, compresses by the flap pressure ring, and fastening with socket head screw 11; Spring 19 is arranged between valve pocket and the flap, and when valve closing, spring is compressed, even there be not the situation of media flow, also has enough seal pressures between the sealing surface of seat on flap sealing surface and the seal ring; When pump was opened, under medium following current thrust, flap moved right, and pressure spring is opened flap simultaneously; Flap is connected in hole axle mode with valve shaft 16, and fastening by locking nut 15, is provided with double " O " RunddichtringO 3 between flap and the valve shaft, prevents that medium from leaking from the fit up gap of flap and valve shaft; The front end and back end of valve shaft is enclosed within respectively in front lining 8, the back bush 17; It is in the endoporus of supporting 9, fastening before front lining places by locking nut 7; Back bush places in the valve pocket endoporus, and is fastening by locking nut 18; The seal ring 10 that has ring-like small boss cooperates with the axis hole form with valve body at valve body upper end-hole place; The seal ring upstream is provided with convex back-up ring 5, prevents that seal ring is axially to left dislocation; Be connected by locating pin 6 between seal ring and the convex back-up ring; The ring-like boss of convex back-up ring cooperates with the back-up ring fixed groove 20 of valve body.

With reference to Fig. 1,5,6,7,8: seal ring is a sealing surface of seat 22 near flap one end.The outer of seal ring is provided with twice " O " type circle, realizes the sealing between seal ring and the valve body, and the medium that prevents valve internal is from the clearance leakage between seal ring and the valve body; Seal ring is provided with ring-like small boss near back-up ring one end, when seal ring is packed valve body into, and the axially displacement to the right of ring-like small boss restriction seal ring; The preceding supporting that is provided with in the seal ring is made of the location annulus of three gussets and front lining; One positioning hole 21 is arranged on the seal ring.The convex back-up ring is arranged on the upstream of seal ring, is made of 25,26,27 3 circular arc pieces, and 25,27 radian is greater than 26,26 is that an internal side diameter is big, the circular arc-like block that outside diameter is little, convex back-up ring are packed into behind the valve body, and being provided with of locating pin guaranteed that block 26 can not come off; In the side of back-up ring near seal ring, be provided with ring-like boss, its effect is: when seal ring is subjected to reflux medium thrust or flap thrust, prevent that seal ring is axially to left dislocation.

Claims

1, the pre-installed monomer axial flow type check valve of a kind of seal ring, the locking nut and seal ring and the convex back-up ring that comprise the spring between valve body, valve pocket, flap assembly, flap and the valve pocket, the valve shaft of flap guiding, the preceding supporting of valve shaft, the front and rear bushings of valve shaft, fastening front and rear bushings, it is characterized in that: valve body is as a whole, the seal ring that has ring-like small boss is at valve body upper end-hole place, the convex back-up ring is arranged before the seal ring, between seal ring and the convex back-up ring locating pin is arranged.

2, the pre-installed monomer axial flow type check valve of seal ring according to claim 1, it is characterized in that: valve body and valve pocket are an overall structure, there is the back-up ring fixed groove that cooperates with the convex back-up ring at valve body upper end-hole place.

3, the pre-installed monomer axial flow type check valve of seal ring according to claim 1, it is characterized in that: valve seat separates with valve body with the seal ring that sealing surface of seat constitutes, and and realize sealing by twice " O " type circle between the valve body, seal ring one end is provided with ring-like small boss, and a positioning hole is arranged on the seal ring.

4, the pre-installed monomer axial flow type check valve of seal ring according to claim 1, it is characterized in that: the convex back-up ring that the seal ring upstream is provided with is made of three circular arc pieces, wherein two big one is little, and a little interior circular arc is longer than external arc, a positioning hole arranged on little one.