CN1071496A

CN1071496A - Sluice valve-type stop valve

Info

Publication number: CN1071496A
Application number: CN 91108198
Authority: CN
Inventors: 王佐才
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-10-14
Filing date: 1991-10-14
Publication date: 1993-04-28

Abstract

A kind of sluice valve-type stop valve has a valve sleeve in spool, be provided with double-deck valve seat at sleeve lining, and corresponding with it flap then has two sealing surfaces; One is the cone brake valve sealing surface, and another is the stop valve sealing surface of plane or taper; On the cone brake valve sealing surface, have one or more circular groove; Above its valve seat, around barrel, have medium fluid inlet channel hole.This valve can reduce erosive wear, guarantees to close tight and increases the service life, and can also reduce because of flap vibration, the loosening fracture accident that is caused.

Description

Sluice valve-type stop valve

The invention belongs to a kind of stop valve.

The typical structure of the high pressure in the known technology, high temperature stop valve such as the Fig. 2 in this Figure of description, Fig. 3 and shown in Figure 4 wherein have the self sealing cut-off valve (Fig. 2, Fig. 4) of the bore that varies in size, and flange-type stop valve (Fig. 3) is also arranged.The main drawback that these stop valves exist is: (1) is because valve sealing face all adopts technologies such as built-up welding, spray fusing, cutting, grinding, so hardness is lower, and general hardness HRC value is between 45～48; (2) the flap lateral force that is subjected to medium that is in operation is impacted, and flap is in operation vibrates, and the concentricity when being difficult to guarantee to close; (3) valve rod and flap connect the mode that adopts T type groove, owing to the gap reason, during by dress, be subjected to the impact of lateral force in level, it is inhomogeneous etc. that the one-sided seal pressure that withstands sealing surface or sealing surface often takes place; (4) sealing surface on the valve seat is in case by being blown damage, is can not repair and scrap.

The objective of the invention is to propose a kind of technological scheme of sluice valve-type stop valve structure, to overcome the drawback of above-mentioned known technology.

The basic comprising of the technical program is:

The first, described sluice valve-type stop valve valve seat is a sleeve valve seat, this valve sleeve by valve gap and and the cap nut be crimped on valve body;

Second, be provided with double-deck valve seat at described sleeve lining, corresponding with it flap then has two sealing surfaces, and one is the contacted cone brake valve sealing surface of flap and upper strata valve seat, and another is the contacted plane of valve seat or the taper stop valve sealing surface in the close liquid flow medium outlet port of flap and lower floor;

The 3rd, on described flap cone brake valve sealing surface, have one or more circular groove that is parallel to each other, its convex shoulder position constitutes the sealing surface of multiple tracks gate valve, in order to the dilatation step-down of fluid with guarantee the sealing of valve;

The 4th, in sleeve upper strata conical surface valve seat above, have media fluid inlet channel hole around the barrel, medium is evenly flowed around forming.

The advantage of the technical program and good effect can be found out from following analysis:

At first, double-deck valve seat, double-sealing face can reduce erosive wear, guarantee that valve closing is tight and increase the service life.From the specific embodiment of this programme shown in the drawings as seen, when valve is in the pass closed procedure, begin as gate valve, the conical surface gap is more and more littler, in this process, high pressure, high temperature fluid make fluid dilatation step-down, thereby reduce the scouring force to sealing surface by the multiple tracks circular groove on the gate valve flap conical surface.If blowing decrease to produce through fluid, wherein arbitrary road sealing surface splits mark or conduit and when losing seal action, other road sealing surface is also complete, also can continue to play seal action.

Secondly, the employing of sleeve valve seat further prolongs the life-span of valve.Seat of stop valve of the prior art all adopts built-up welding, turning, grinding, the heavy caliber stop valve that also has adopts the integral solder formula, therefore when valve seat because of after washing away, blow damage generation zanjon, ordinary circumstance promptly can make valve scrap, speed of Sun Huaiing and quantity are appreciable like this.Adopt after the sleeve valve seat, material hardness is improved, its HRC value can surpass 60; On the other hand, when valve seat is blown damage, conveniently replaced again flap and valve seat, and need not change valve body.Compare with general stop valve, this sluice valve-type stop valve life-span can be improved tens times and even tens times.

Also have; the liquid flow medium is crossed flap, the outlet of the valve seat flow direction from the inlet channel aperture around the sleeve; avoided the one-sided of general stop valve medium to flow; the concentricity that can keep flap and valve seat preferably; flap is in start and stop or long-term opening process simultaneously; can not form flap vibration, loosening, tired, even cause fracture accident because of the one-sided active force of medium.

Fig. 1 provides the specific embodiment of the technical program.

Valve shown in Fig. 1, comprise valve body (1), valve seat (3), flap (4), valve rod (5) and valve gap (10), they are by valve seat pad (2), packing ring (6), seal ring (7), all trim ring (8) and and cap parts Composite joints such as (9) together, valve body (1) is fastened on the working equipment by support (11), valve seat (3) on valve body (1) internal valve seat cushion (2) is the double-deck valve seat of a sleeve type, the upper strata valve seat is corresponding with the cone brake valve sealing surface of flap (4), lower floor's valve seat is corresponding with flap (4) stop valve sealing surface, on the sealing surface of the discharge gate of flap (4), have annular groove, above the valve seat sealing surface of the discharge gate, along the inlet channel hole that has medium all around, MEDIA FLOW is from the inlet channel hole of valve body (1) inlet (A) through medium, flows to the outlet (B) of valve body (1) along flap (4) and valve seat (3).

Claims

A kind of sluice valve-type stop valve comprises valve body, valve seat, flap, valve rod and valve gap, they by sealing and also cap thread link material or combination of devices be in the same place, it is characterized in that:

I, described valve seat are sleeve valve seats, this valve sleeve by described valve gap and and the cap nut be crimped on valve body;

II, be provided with double-deck valve seat at the valve sleeve inwall, corresponding with it flap then has two sealing surfaces, one is the contacted cone brake valve sealing surface of flap and upper strata valve seat, and another is the contacted plane of valve seat or the taper stop valve sealing surface in the close liquid flow medium outlet port of flap and lower floor;

III, on described flap cone brake valve sealing surface, have one or more circular groove that is parallel to each other, its convex shoulder position promptly constitutes the sealing surface of multiple tracks gate valve;

IV, above sleeve inner brake valve cone shape sealing surface, have medium fluid inlet channel hole around the barrel.