CN2245695Y - Double-sealing plate sluice valve - Google Patents

Abstract

The utility model relates to a double-sealing plate sluice valve, which is characterized in that the two sealing surfaces of a sluice plate (4) are respectively laid with two sealing rings (2, 3), and one sealing ring is a reinforced polytetrafluoroethylene plastic sealing ring, and the other sealing ring is plastic sealing ring which is formed in the method that the surface of a rubber ring is provided with one layer of reinforced polytetrafluoroethylene in a spray coating way. because the utility model adopts the sealing structure of the front of the valve and the back of the valve, the sealing can be more reliable, and the service life can be improved; the structure is reasonable, the maintenance is convenient, flanged pads in the valve can be reduced or omitted, and the leakage at the part of a stuffing box, etc. can be reduced and avoided.

Description

The double-sealing plate valve

The utility model relates to plate valve, and the spy is a kind of double seal gate valve of good seal performance in addition.

As everyone knows, existing plate valve is mainly pressed benefit, handwheel, bolt, fat injecting mechanism, automatic indentation sealing fat mechanism by valve body, valve gap, flashboard, valve seat, spring, nut, valve rod, filler and sealing case is pressed, the seal gease compensation mechanism is formed.Valve body is that an automatic means of press seals fat mechanism respectively is equipped with in cast steel, valve body lumen both sides, this mechanism is by the oil cylinder that fills seal gease, can form along piston and valve seat that oil cylinder inner surface moves, a seal gease compensation pressing mechanism respectively is housed at the position, front and back of valve body outside, and this mechanism returns and in the screw of steel ball and the seal gease box body seal gease is housed and forms by being screwed in sealed lipid box, sealing case gland, non-return steel ball, block on the valve body.This plate valve is when using under the various working conditions, because temperature, the turbidity test of medium, environment and flashboard, valve seat, the precision of processing such as oil cylinder, condition effect such as surface roughness, existing plate valve realizes that by the differential pressure sealing principle valve seal is insecure fully, as the environment in winter, during the medium temperature step-down, seal gease viscosity just increases, intrinsic pressure difference value will push away motionless in-oil cylinder piston, seal gease does not just enter between the sealing pair of valve, cause valve to leak, at this moment, just has only artificial sealing case gland with spanner rotary valve outside, seal gease is forced to be pressed in the flashboard circular groove, or fill seal gease with the high pressure oil gun seal gease is injected, realize sealing.Valve switch once will be gone into the worker and be pressed into once, increase administrative staff's labor intensity; Its two, in fact two seal gease compensation mechanisms of existing product valve body outer installment have increased by two leakage points, bad or time is used long point as accuracy of manufacturing, end the frame worn steel ball after medium be easy to from the sealed lipid box leakage, this problem facts have proved; Its three, existing plate valve is owing to by seal gease, realize oil film seal, just can not use (much media are to contact with seal gease) in some pipe-line systems of a lot of industrial departments such as oil refining, chemical industry, electric power, tap water, thereby use face is narrow; It is little, the big Heavy Weight complex structure of volume, and the manufacture cost height, price is expensive, can not use social benefit poor in a lot of construction project.

The purpose of this utility model, a kind of simple in structure, in light weight, the good seal performance that provides in order to overcome prior art above shortcomings part just, switch moment is little, light and flexible, accuracy of manufacturing is low, and long service life is easy to maintenance, low cost of manufacture, the novel flat-plate gate valve that social benefit is good.

Above-mentioned purpose of the present utility model is to realize by such technological scheme, be that the utility model comprises valve body, valve seat, flashboard, valve rod and handwheel, it is characterized in that: on two sealing surface positions of flashboard, each inlays the two seals circle, valve seat cooperates with valve body by O shape circle, and laterally is being supported on the valve body by spring.

Sealing when the utility model has changed into the sealing behind the valve after and before the valve owing to described structure, sealing mainly is to lean on the elastic force of valve seat pressure spring to guarantee in the time of inlet/outlet, therefore when designing seating spring, spring presses sum greater than sealing force.During the valve assembling, the plastic cement O RunddichtringO that adopts on the flashboard is under the spring pressure effect, at first tightly be attached on the sealing surface of seat,, sealing surface of seat contacted with the flashboard metallic sealing section along with the first road reinforced TFE seal ring that adopts on the flashboard is compressed.When valve closing, flashboard moves down, the first road 4F circle that the impurity that is stained with on the sealing surface of seat, dirt etc. are just inlayed on the flashboard two sides is wiped off, has guaranteed that the second road plastic cement O type circle is not scratched, reduce wear and the south that is situated between in the erosion effect.When valve closing puts in place, be compressed owing to the two seals circle exceeds the metal surface, thereby realized valve two sides, dual reliable sealing, promptly the inlet/outlet end is realized sealing simultaneously.

Plastic cement O shape circle can be according to the working medium various engineering plastics that spraying is suitable on the rubber o-ring that do not coexist, and this O shape circle had both kept the function of teflon vinyl plastics, had kept the function of rubber o-ring good springiness again.

Structure of the present utility model as shown in drawings.

Accompanying drawing is a structure cut-away view of the present utility model.

Referring to accompanying drawing: 1 is valve body among the figure, and 2 is the reinforced TFE plastic seal ring, and 3 for scribbling the plastic cement seal ring that one deck reinforced TFE constitutes on the rubber ring surface, 4 is flashboard, and 5 is pressure spring, and 6 is glue rubber O shape circle, 7 is the lock seat, and 8 is valve rod, and 9 is handwheel.Wherein, seal ring 2 exceeds flashboard sealing surface 0.25～0.28mm, and its inserting slot is a straight trough; Seal ring 3 exceeds flashboard sealing surface 0.4～0.6mm, and its inserting slot is a dovetail groove.

The utility model reduces the leakage at stuffing box place owing to adopt sealing means after and before the valve, in order further to improve the sealability of valve, a fat injecting mechanism that injects the seal gease of valve rod and valve gap stuffing box fitted seal can be housed at valve gap stuffing box position.This mechanism by greasing cover, bolt, steel ball pin form.In the greasing cover, valve stem seal fat is housed, when stem packing is leaked, rotation greasing bolt, the seal gease of pressing, contract backs down steel ball, and seal gease just enters into stem surface smoothly and realizes sealing, does not therefore change filler for a long time.

The utility model has solved the shortcoming that existing product exists fully owing to described structure, it is compared with existing flat gate valve, except the advantage that has kept existing flat gate valve, also has the following advantages:

One, sealing is more reliable. Because in the time of the valve inlet sealing, outlet also Can realize sealing, the dual face seals effect is than single face good seal.

Two, improved service life, valve is imported and exported simultaneously sealing, and sealing surface is not With medium contact, the impurity in the medium, particle can pickup and wearing and tearing scratch sealings Face, sealing surface can be avoided the erosion effect of medium, have prolonged the life-span of sealing surface.

Three, rational in infrastructure, saved the automatic injecting mechanism of stop-leak compound and stop-leak compound and mended Repay pressing mechanism and make weight saving, simple in structure, do not need workman's sealing of regularly annotating Fat has alleviated labour intensity, has therefore reduced manufacturing cost, and social benefit is good.

Four, easy to maintenance, pipeline under the pressure medium effect, the maintenance valve or from Carry out blowdown in the valve, existing flat gate valve is impossible, this utility model technology Guaranteed the blowdown with pressure of inlet seal realization valve.

Five, reduce or avoid flange gasket in the valve, stuffing box etc. to locate to leak.The dynamic pressure of inlet seal rear valve body lumen reduces greatly, has improved middle flange gasket, the sealability that stuffing box etc. are located.

The utility model is widely used in the pipeline of conveying gas, liquid and Korrosionsmedium.

Claims (2)

1, a kind of double-sealing plate valve, comprise valve body (1), flashboard (4), valve seat (7), valve rod (8) and handwheel (9), it is characterized in that: on two sealing surface positions of flashboard (4), each inlays two seals circle (2,3), valve seat cooperates with valve body by O shape circle, and is laterally supporting by spring (5).

2, double-sealing plate valve according to claim 1, it is characterized in that: two seal rings (2,3) that are set in flashboard (4) divide other to spray the plastic cement seal ring that one deck reinforced TFE constitutes for the reinforced TFE plastic seal ring with on the rubber ring surface, exceed flashboard sealing surface 0.25～0.28mm and 0.4～0.6mm respectively.