CN201003625Y

CN201003625Y - High-performance gas flat plate gate valve

Info

Publication number: CN201003625Y
Application number: CNU2006201551498U
Authority: CN
Inventors: 杨志中; 赖海瑜; 王志中
Original assignee: MINGZHU GROUP CO Ltd GUANGDONG PROV
Current assignee: MINGZHU GROUP CO Ltd GUANGDONG PROV
Priority date: 2006-12-25
Filing date: 2006-12-25
Publication date: 2008-01-09
Anticipated expiration: 2016-12-25

Abstract

The utility model relates to a high performance type fuel gas plate valve, which consists of a valve body, a valve plate, a valve cover, a valve rod, a valve rod nut and a handwheel. The utility model is characterized in that, surface of the valve plate is painted with anticorrosive iron alloy or plasma nitride coating. Front surface of valve base contains polyfluortetraethylene and high chrome steel anticorrosive alloy material made by resurfacing welding. Main seal method of the utility model depends on hard and soft dual combined seal with high reliability. Outer profile of the valve base has an O-shaped sealing ring, and back of the valve base has a flexible sealing cushion, which can prevent leakage on both lateral and bottom of holes on the valve base as well as achieve dual seal of seal pair. Surface of the valve plate is sprayed with anticorrosive iron alloy material or plasma nitride coating, so as to increase hardness and corrosive resistance for surface of the valve plate. The utility model adopts grease hole during filling sealing grease parts so as to conduct emergency seal, achieve lubrication and reduce operational force. Sealed surface can form a protective membrane to prevent pollutants accumulating and eroding the sealed surface. Therefore, the utility model can improve seal property and service life of the valve.

Description

High-performance combustion gas plate valve

Technical field

The utility model relates to a kind of gate valve, especially a kind of combustion gas plate valve of the dual compound seal of high-performance soft or hard.

Background technique

At present, the gate valve that uses in gas pipeline generally adopts general gate valve or ordinary flat gate valve, and valve seat and flashboard are subject to that combustion gas is corroded or are influenced its sealability by contamination build-up such as dust, tar, cause easy leakage, thereby shortened the working life of gate valve.In addition, China Patent No. 98225297.8 discloses a kind of combustion gas plate valve, and its valve body is made up of main valve body and auxiliary valve body, and an elastic seal ring and O RunddichtringO respectively are housed on the valve seat of main valve body and auxiliary valve body.It is by the spacing of sealing surface on adjusting main valve body and the auxiliary valve body, thus the sealability of raising gate valve, and its shortcoming is: with the primary seal of O RunddichtringO as gate valve, damage easily in pollutant media such as dust, tar, shortened working life; Whole flashboard adopts resistant material to make, and has increased the cost of production of gate valve, is not suitable for the occasion that pressure is higher or bore is bigger and uses; In addition, adopt main valve body, auxiliary valve body two style structure, increased number of spare parts and assembling difficulty.

Summary of the invention

The purpose of this utility model just provides a kind of corrosion-proof wear, seals high-performance combustion gas plate valve reliable, long service life.

The utility model realizes that the technological scheme that above-mentioned purpose adopted is: the utility model comprises valve body, flashboard, valve gap, valve rod, Stem Mut, handwheel, there are corrosion-resistant ferrous alloy material or plasma nitrided layer in described flashboard surface, and there are teflon and the corrosion-resistant build-up welding alloy material of High Chrome Steel in the valve seat front.

The described valve seat back side is provided with elastic sealing gasket, and the valve seat outer side surface is provided with the O RunddichtringO.

Described valve body lumen two valve seat orifice are provided with the greasing hole.

Described valve seat is provided with the greasing passage.

Described corrosion-resistant ferrous alloy material is Fe3, Fe4, powder 302.

The corrosion-resistant build-up welding alloy material of described High Chrome Steel is D502, D507, D507Mo.

Primary seal of the present utility model adopt soft be teflon, be the dual compound seal of High Chrome Steel metal corrosion resistant material firmly, increased the reliability of sealing; The valve seat outer side surface promptly radially is equipped with the O RunddichtringO, and elastic sealing gasket promptly axially is equipped with at the back side, has guaranteed that gate valve is difficult for leaking in the side and the bottom surface of valve seat orifice, has realized the double seal of secondary sealing; Corrosion-resistant ferrous alloy material of flashboard surface spraying weld or plasma nitrided layer have improved the hardness and the corrosion resistance on flashboard surface.The utility model adopts the greasing hole to fill the seal grease structure; play emergent sealing and lubrication, reduced practical operation power, can form protective film at sealing surfaces; the not contaminated thing of protection sealing surface gathers or corrodes, thereby improves the sealability of gate valve and the working life of prolongation gate valve.In addition, because elastic sealing gasket is equipped with at the valve seat back side, no matter gate valve is standard-sized sheet or complete shut-down, and flashboard coincide with sealing surface of seat all the time, and sealing surface is protected, and not directly washed away by medium, thereby has prolonged the working life of flashboard.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the enlarged diagram of valve seat.

In the drawings: valve body 1, flashboard 2, valve seat 3, teflon 4, greasing hole 5, greasing passage 6, O-ring seals 7, elastic sealing gasket 8, valve gap 9, valve rod 10, Stem Mut 11, handwheel 12.

Embodiment

Below in conjunction with embodiment, the utility model is described in further detail.

Embodiment one

Valve seat 3 is installed in the seat hole, valve body 1 two ends, valve seat 3 outer side surfaces are equipped with O RunddichtringO 7, elastic sealing gasket 8 is equipped with at valve seat 3 back sides, make valve seat 3 under gaseous-pressure, have piston effect, guarantee that pipeline internal combustion gas medium can not leak by the axial position and the radial position of valve seat orifice, can realize the double seal of the secondary sealing of gate valve.Valve seat 3 is tightly fitted with flashboard 2 under the effect of elastic sealing gasket 8, and the protection sealing surface is not subjected to the combustion gas erosion medium resistance, and sealability is reliable; Elastic sealing gasket 8 has certain decrement, makes valve seat 3 be adjacent to flashboard 2 all the time, guarantees the reliability of primary seal.Inlay teflon 4 on valve seat 3 sealing surfaces that contact with flashboard 2, teflon 4 has the foul removed on the flashboard 2 and the effect of selflubricating, reduced use moment, and built-up welding High Chrome Steel corrosion resistant material such as D502, D507, D507Mo etc., see GB 984-85 surfacing electrode, play dual compound seal effect; Flashboard 2 is contained in the centre of two ends valve seat 3, flashboard 2 adopts plain steel, flashboard 2 surface spraying or the corrosion-resistant ferrous alloy materials of surfacing, corrosion-resistant ferrous alloy material has Fe3, Fe4, powder 302 etc., see JB 3168 surfacing alloy powder technical specifications, both improve surface hardness than whole stainless steel flashboard, saved cost again; In two valve seat orifice positions of valve body 1 lumen, respectively adorn a seal gease filler plug, make things convenient for grease to inject valve seat 3, enter flashboard 2 surfaces by the greasing hole 5 on the valve seat 3 through greasing passage 6 then.Flashboard 2 is installed between two seal valve seats 3, and valve rod 10 1 ends link to each other with flashboard 2, and the stuffing hole that valve rod 10 the other ends pass valve gap 9 is connected with Stem Mut 11, and Stem Mut 11 is fitted together with handwheel 12.

Embodiment two

Valve seat 3 is installed in the seat hole, valve body 1 two ends, valve seat 3 outer side surfaces are equipped with O RunddichtringO 7, elastic sealing gasket 8 is equipped with at valve seat 3 back sides, inlay teflon 4 or reinforced TFE on valve seat 3 sealing surfaces that contact with flashboard 2, and built-up welding High Chrome Steel corrosion resistant material such as D502, D507, D507Mo etc., see the GB984-85 surfacing electrode; Flashboard 2 is contained in the centre of two ends valve seat 3, flashboard 2 adopts plain steel, flashboard 2 surfaces are carried out plasma nitridation process and are handled, promptly in the rough vacuum nitrogen containing atmosphere, utilize the glow discharge that produces between workpiece and the anode to carry out nitriding, form plasma nitrided layer, to improve the wear resistance and the corrosion proof surface chemical heat-treatment process of workpiece surface; In two valve seat orifice positions of valve body 1 lumen, respectively adorn a seal gease filler plug, make things convenient for grease to inject valve seat 3, enter flashboard 2 surfaces by the greasing hole 5 on the valve seat 3 through greasing passage 5 then.Flashboard 2 is installed between two seal valve seats 3, and valve rod 10 1 ends link to each other with flashboard 2, and the stuffing hole that valve rod 10 the other ends pass valve gap 9 is connected with Stem Mut 11, and Stem Mut 11 is fitted together with handwheel 12.

When the utility model is used to close gas pipeline, handwheel 12 is driven the rotation of Stem Mut 11 clockwise directions, Stem Mut 11 drives flashboard 2 by valve rod 10 and moves downward in the middle of two valve seats 3, and flashboard 2 sealing fuel tube road junctions reach the purpose of closing gas pipeline; When the utility model is opened gas pipeline, handwheel 12 is driven Stem Mut 11 rotation counterclockwise, Stem Mut 11 drives flashboard 2 by valve rod 10 and moves upward in the middle of two valve seats 3, and combustion gas is passed through gas pipeline smoothly by the opening on the flashboard 2.The utility model in use; can add seal greases by greasing hole 5, grease enters the sealing surfaces of flashboard 2 and valve seat 3 by greasing passage 6, playing emergent sealing and lubricated effect; the protection sealing surface is not gathered by dirt or corrodes, and has prolonged working life.

Claims

1, a kind of high-performance combustion gas plate valve, comprise valve body (1), flashboard (2), valve gap (9), valve rod (10), Stem Mut (11), handwheel (12), it is characterized in that there are corrosion-resistant ferrous alloy material or plasma nitrided layer in flashboard (2) surface, there are teflon (4) and the corrosion-resistant build-up welding alloy material of High Chrome Steel in valve seat (3) front.

2, high-performance combustion gas plate valve according to claim 1 is characterized in that described valve seat (3) back side is provided with elastic sealing gasket (8), and valve seat (3) outer side surface is provided with O RunddichtringO (7).

3, high-performance combustion gas plate valve according to claim 1 is characterized in that described valve body (1) lumen two valve seat orifice are provided with greasing hole (5).

4, according to claim 1 or 3 described high-performance combustion gas plate valves, it is characterized in that described valve seat (3) is provided with greasing passage (6).