CN2849359Y

CN2849359Y - High performance cage regulating valve

Info

Publication number: CN2849359Y
Application number: CN 200520027969
Authority: CN
Inventors: 张耀辉; 李艳荣; 周洪义; 张玮
Original assignee: TIANJIN JINGTONG CONTROL INSTRUMENT TECHNOLOGY Co Ltd
Current assignee: TIANJIN JINGTONG CONTROL INSTRUMENT TECHNOLOGY Co Ltd
Priority date: 2005-10-28
Filing date: 2005-10-28
Publication date: 2006-12-20
Anticipated expiration: 2015-10-28

Abstract

The utility model relates to a cage regulating valve, particularly a high performance cage regulating valve. In order to change processing and timing difficulties of the original cage regulating valve and to enhance leakage quantity grade, the utility model adopts a structure of a floating valve seat plus a single sealing surface plus elastic seal, namely, the valve seat and a valve cage are both arranged on a valve body surface without fixed structures. As long as assembled correctly, the valve seat and the valve cage can be automatically concentric. The sealing surface is composed of a metal sealing surface between a valve core and the valve seat, and a nonmetal elastic seal structure between a valve cover and the valve cage. The nonmetal structure adopting a graphite pad largely improves elasticity and performance of high temperature resistance. One-sided metal seal reduces machine work difficulty. In addition, the graphite sealing way raises sealing performance and usage temperature range to a great extent. Compared with the old structure, the leakage quantity is raised by a grade on the basis of not increasing cost and the machine work difficulty.

Description

The high-performance cage type regulating valve

Technical field

The utility model relates to a kind of cage type regulating valve, particularly a kind of high-performance cage type regulating valve.

Background technique

Adopt screw thread to closely cooperate at present between cage type regulating valve valve seat and the valve body, and the stuffing hole of valve processing request valve gap, valve rod, valve cage, valve seat, valve body must be coaxial with the circular hole of valve seat connecting part, therefore these several parts have strict form and position tolerance and size tolerance requirements when machining, the machining difficulty is very big, when assembling to parallelism, concentricity, strict demand is also arranged on the perpendicularity, sealing surface at valve gap and valve cage adopts asbestos packing to add metal winding sheet simultaneously, asbestos packing is nonelastic, long-term use easily produces the gap and leakage is arranged, and three grades of leakage quantities therefore can only be up to state standards.

Summary of the invention

Problem in view of above-mentioned prior art existence, the utility model provides a kind of high-performance cage type regulating valve, and adopting valve seat, valve cage is floating structure, as long as correct full-automatic the formation with one heart of assembling, simultaneously asbestos washer is changed into Graphite pad, have better elasticity and resistance to high temperature.

The utility model is that the technological scheme that overcomes the above problems employing is: a kind of high-performance cage type regulating valve, form by valve body, Graphite pad, valve seat, spool, supporting ring, seal ring, valve cage, metal wound gasket, metallic shim, Graphite pad, valve gap, valve rod, pin etc., it is characterized in that: valve seat is placed on the Graphite pad in the valve seat orifice of valve body, supporting ring is in interior, seal ring are sleeved on groove on the valve core outer surface outside, spool is fixed on pin on the bottom body of rod of valve rod, and valve is in the sealing surface that makes spool when cutting out and the sealing surface of valve seat is close to; Valve cage is sleeved on the outside of spool, is placed on the upper-end surface of valve seat; Valve gap is withheld on valve cage and pressed spool, is lined with metal wound gasket, metallic shim, Graphite pad in the middle of the surface of contact place of valve gap and valve cage from bottom to top successively, and the valve gap top is passed in the valve rod upper end, exposes outside the valve gap.

Characteristics of the present utility model: adopted valve seat float+single sealing+elastic sealing structure reduced difficulty of processing and assembling difficulty, do not increase under the prerequisite at cost, make the performance of valve obtain that big lifting, life-span obtain prolonging, leakage rate improves a grade and can reach national leakage rate level Four.

Description of drawings

Fig. 1: the utility model structural representation and book extract accompanying drawing as an illustration

Among the figure: 1. valve body, 2. Graphite pad, 3. valve seat, 4. sealing surface, 5. spool, 6. supporting ring, 7. seal ring, 8. valve cage, 9. metal wound gasket, 10. metallic shim, 11. Graphite pads, 12. valve gaps, 13. valve rods, 14. pins.

Embodiment

As shown in Figure 1, Graphite pad (2), metal twines sheet (9), metallic shim (10), Graphite pad (11), be the thin slice ring bodies, supporting ring (6) is that the cross section that fluorine rubber or alkene class rubber are made is square ring bodies, has elasticity, seal ring (7) approaches ring bodies for the depth of section rectangle identical with supporting ring (6) of the tetrafluoroethylene material system that carbon is filled, nonelastic, it is the cylindrical ring body at the thick end that Open Side Down that spool (5) is cast, on its outer side surface top a rectangular recess is arranged, also have four through hole relief holes (15) on the upper-end surface of spool, grinding an inclined-plane in the bottom end outside of spool (5) is sealing surface (4); Supporting ring (6), seal ring (7) are inserted in the groove of spool (4) in succession, and the lower end of valve rod (13) is passed the center hole of spool (4) and fixed with pin (14); Valve seat (3) is placed on the endoporus of valve body (1) by Graphite pad (2), can do the adjustment of trace, the sealing surface (4) of spool (5) is floated with the concentric automatically valve seat that is of the sealing surface on valve seat (3) endoporus, valve is in the sealing surface (4) of spool when cutting out (5) and the sealing surface of valve seat (3) is close to the single sealing of formation, valve cage (8) is sleeved on outside the spool (5), the inner hole surface that makes the external cylindrical surface of spool (5) and valve cage (8) is for movingly, is lined with metal from bottom to top successively and twines sheet (9) in the middle of the surface of contact place of spool (5) and valve cage face, tinsel (10), Graphite pad (11); Graphite pad (2), Graphite pad (11) can be by crowded broken when being squeezed, and particle floats the additional gap value that produces and forms elastic sealing structure.

Claims

1. high-performance cage type regulating valve, by valve body (1), Graphite pad (2), valve seat (3), spool (5), supporting ring (6), seal ring (7), valve cage (8), metal wound gasket (9), metallic shim (10), Graphite pad (11), valve gap (12), valve rod (13), pin compositions such as (14), it is characterized in that: valve seat (3) is placed on the Graphite pad (2) in the valve seat orifice of valve body (1), supporting ring (6) is interior, seal ring (7) is sleeved in the groove on spool (5) outer surface outside, spool (5) is fixed on pin (14) on the bottom body of rod of valve rod (13), and valve is in the sealing surface (4) of spool when cutting out (5) and the sealing surface of valve seat (3) is close to; Valve cage (8) is sleeved on the outside of spool (5), is placed on the upper-end surface of valve seat (3); Valve gap (12) is withheld on valve body (1), and compress valve cage (8), at valve gap (12) and middle metal wound gasket (9), metallic shim (10), the Graphite pad (11) of being lined with successively from bottom to top in the surface of contact place of valve cage (8), valve gap (12) top is passed in valve rod (13) upper end, exposes outside the valve gap (12).

2. high-performance cage type regulating valve as claimed in claim 1, it is characterized in that: spool (5) is a cylindrical cup in the thick end that Open Side Down, it is the groove of rectangle that one cross section is arranged on the cylndrical surface at the bottom of the cup, on at the bottom of the cup, a center hole is arranged, relief hole (15) with four through holes, also have the inclined hole of a pin (14), one inclined-plane sealing surface (4) is arranged in the outside of spool (5) lower end surface from the cup bottom surface to center hole.