CN201159310Y - Check valve - Google Patents

Abstract

The utility model relates to a stop valve, wherein the inlet and outlet of the valve body are provided with flanges, the valve body is provided with a flap hole vertically, the flap is movably fit in the flap hole and is provided with a spring, a support plate, a baffle ring and a valve cap are provided above a spring in the flap hole from down to up, a sealing ring slot and a O-shaped sealing ring are provided between the flap hole and the outer circumference of the support plate, the baffle ring is provided in a slot on the inner wall of the flap hole, the valve cap and the support plate are tensioned by a bolt to be set at two sides of the baffle ring. When in use, the stop valve can resolve the sealing problem between the valve body and the valve cap effectively, to improve the application reliability in use and reduce the size of the stop valve, thereby saving material and reducing production cost. When in production, the utility model can adopt fractional forging and welding method, to improve strength, prolong service life and simplify the manufacture technology.

Description

Safety check

Technical field

The utility model relates to a kind of safety check, the Through-conduit check valve that particularly a kind of flap slides along the valve body vertical center line.

Background technique

Safety check claims check valve, one-way valve again.Be used for pipe-line system, the medium mobile power that produces in tube road opens and closes automatically, and belongs to a kind of automatic valve, is used for preventing that medium from flowing backwards at pipeline.Difference by structural design can be divided into Lift check valve, Swing check valve and butterfly check valve.Wherein, Lift check valve can be divided into vertical and horizontal two kinds.Horizontal Lift check valve at work, its flap slides along the valve body vertical center line, is installed on the horizontal pipe and uses.Flap is ball or other shape flaps of cooperating with valve body sealing surface.Valve body is processed with pilot hole between flap top and bonnet lower, flap can be in the valve body pilot hole free lifting.When the medium postive direction when import flows into valve body, the gravity that medium thrust promotion flap overcomes spring power and flap rises along pilot hole, the flap sealing surface breaks away from the sealing surface of valve body and opens, medium from the importer of valve to flowing to Way out, when media flow stops or during reverse flow, flap drops on the valve seat by deadweight and spring force effect, by the sealing surface prevention medium reverse flow of the two.In the straight-through type lift check valve, the opening that the pilot hole of flap is installed on the valve body covers with valve gap, adopts the sealing means sealing of common flange gasket 16 between valve gap and the valve body.Adopt the compression type valve bonnet seal to cause the valve body construction size big, be easy to generate leakage, particularly in height, Middle pressure valve,, affect production adversely owing to leak amount of maintenance and the high material consumption that causes.

The model utility content

In order to solve the technological deficiency that prior art exists, the purpose of this utility model is to provide a kind of safety check, can effectively solve the sealing problem between valve body and the valve gap, and then reduce the construction size of safety check, improve the reliability of safety check, economical with materials reduces production costs.

To achieve these goals, the technical solution of the utility model is:

A kind of safety check, valve body import and outlet have flange, valve body has the flap hole along the vertical line direction, flap being contained in the flap hole movingly, spring is housed on the flap, wherein above the inner spring of described flap hole, supporting plate, baffle ring and valve gap is housed successively from bottom to top, between flap hole and supporting plate outer peripheral surface, have seal groove and O-ring seals, baffle ring places in the groove of flap hole inwall, and valve gap and supporting plate are strained in the baffle ring both sides by bolt.

The utility model safety check wherein has two seal grooves and two O-ring seals between flap hole and supporting plate outer peripheral surface.

Because after adopting such scheme, the utility model safety check has in use well solved the sealing problem between valve body and the valve gap, solved safety check integrity problem in use, dwindle the construction size of safety check simultaneously, saved material, reduced manufacture cost.In manufacture process, can take substep forging, welding method production, improve safety check intensity, increase the service life, make manufacturing process simple and convenient.

Description of drawings

Fig. 1 is the utility model safety check sectional view;

Fig. 2 is a prior art safety check sectional view.

Number in the figure:

1. inlet, 2. flange, 3. valve body, 4. equalizing orifice, 5. flap hole, 6. supporting plate, 7. bolt, 8. valve gap, 9. baffle ring, 10. seal ring, 11. springs, 12. decompressing grooves, 13. flaps, 14. sealing surfaces, 15. outlets, 16. flange gaskets.

Embodiment

As shown in Figure 2, in the structural design of the safety check of prior art, the combination of valve body and valve gap is by bolt 7 valve gap 8 to be fixed on the valve body 3, in order to make safety check at work, the medium of the high pressure of being carried does not leak, and liner upper flange sealing gasket 16 screws bolt 7 between valve body 3 and valve gap 8, by valve gap 8 flange gasket 16 is pressed on the valve body 3, leaks out to stop the endoceliac high-pressure medium of valve.For the effect of strengthening preventing leaking, on the relative face of valve body 3 and valve gap 8, make groove usually, make in the flange gasket embedding groove that is pressed.Because bolt is applied to compaction forces inequality, becoming flexible of bolt and wearing out and damaging of flange gasket on the valve gap 8, make this sealing means can not solve contingent dielectric leakage problem fully, the medium that leaks directly contacts bolt 7 corrosion bolts 7, further aggravation is leaked, and finally makes the safety check operational failure.

In order to solve the technological deficiency that existing safety check exists, the design structure of the utility model safety check as shown in Figure 1 is, at the inlet 1 of valve body 3 with export the passage that has flowing medium between 15, inlet 1 has the flange 2 that is connected use with other pipelines with outlet 15, valve body 3 vertically has a flap hole 5, flap 13, spring 11, supporting plate 6, valve gap 8 is installed in the flap hole 5 from bottom to top successively, outer surface has being contained in the flap hole 5 of flap 13 activities of multiple tracks decompressing groove 12, the following end periphery of flap 13 has the sealing surface phase driving fit of sealing surface 14 and relative valve body 3, constitutes the essential structure of safety check.Flowing medium 1 enters valve body 3 from entering the mouth, gravity and spring 11 elastic force that pressure medium overcomes flap 13 upwards boost flap 13, the sealing surface 14 of flap 13 is separated with valve body 3 corresponding sealing surfaces, constitutes the media flow passage, make the flowing medium can be 1 mobile to outlet 15 from entering the mouth.When medium stops to flow or have the opposite direction flow tendency, flap 13 is under self gravitation and spring 11 elastic force effects, and the following whereabouts of flowing medium backpressure effect that enters valve pocket by equalizing orifice 4, the sealing surface 14 of flap 13 is tightly fitted with the sealing surface of valve body 3, closed channel stops medium to flow in the other direction.The external peripheral surface of flap 13 has a plurality of decompressing grooves 12, and spring 11 places between flap 13 and the supporting plate 6, and the elastic force that spring 11 provides makes the action of flap 13 whereabouts closed dielectric passages more reliable.Spring 11 tops are provided with supporting plate 6, and baffle ring 9 places in the groove of flap hole, supporting plate 6 top 5 inwalls, as the force bearing point of spring 11 the other ends.May leak into outside the safety check by supporting plate 6 and valve gap 8 again by the medium that drains to flap 13 tops between flap 13 and the flap hole 5 in order to stop, between flap hole 5 and supporting plate 6 outer peripheral surfaces, be provided with seal groove and O-ring seals 10, stop and leak, seal ring 10 can be provided with twice.Valve gap 8 is strained in baffle ring 9 both sides by bolt 7 with supporting plate 6, and valve gap 8, supporting plate 6 are fixed with valve body 3.Because use O-ring seals 10 between flap hole 5 and supporting plate 6 outer surfaces, multiple-sealed circle has effectively prevented dielectric leakage, has improved the sealing reliability of safety check.The valve gap of cancellation prior art and the Placement of valve body reduce the size of valve body 3, and be easy to install, and manufacture cost has been saved in the materials consumption of saving safety check.

Claims (2)

1, a kind of safety check, valve body import and outlet have flange, valve body has the flap hole along the vertical line direction, flap being contained in the flap hole movingly, spring is housed on the flap, it is characterized in that: above the inner spring of described flap hole, supporting plate, baffle ring and valve gap are housed successively from bottom to top, between flap hole and supporting plate outer peripheral surface, have seal groove and O-ring seals, baffle ring places in the groove of flap hole inwall, and valve gap and supporting plate are strained in the baffle ring both sides by bolt.

2, safety check according to claim 1 is characterized in that: have two seal grooves and two O RunddichtringOs between flap hole and supporting plate outer peripheral surface.

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