CN2527794Y - Reverse opening/closing stop valve - Google Patents

Abstract

Disclosed is a reverse on-off disconnecting valve which is designed on the basis of the improvement of the current disconnecting valve. The utility model is characterized in that a section of straight tube is added at the lower part of a valve body and a seal cover is arranged at the lower part of the straight tube; the seal surface of a valve seat directly processed or additionally arranged on the valve body is positioned below an interlayer in the valve body; a valve clack is positioned below the valve seat; the valve is off when the valve clack ascends and clings to the seal surface of the valve seat and the valve is completely on when the valve clack descends in the straight tube at the lower part of the valve body; a medium must go into the valve cavity from the lower part of the valve clack. Compared with the current large amount of applied disconnecting valves, the utility model has only a little change; even if the valve is sealed by the medium pressure, the utility model still have excellent sealability and if used at the terminal of a piping, the utility model can become a real no-leakage valve. Because of the scientific and advanced design principle, simple structure and excellent properties, the utility model can fully substitute the current disconnecting valves and show evident economic and social benefits.

Description

Reversing opening and closing cut-off valve

The utility model relates to a kind of reversing opening and closing cut-off valve, and it can be widely used in the productive life every field and carry various liquid or gas, is particularly suitable for being used in the terminal of various pipelines and is used to carry poisonous, harmful or mordant medium.

Advantages such as stop valve is simple in structure because of having, and is easy to maintenance are so use very extensive in production and sphere of life.But medium was to enter valve body from valve seat and flap below when existing most stop valve used, to seal required forced draught direction opposite for medium force direction and flap during valve closing, pressure medium raises and easily causes medium to leak (hereinafter to be referred as internal leakage) from entrance point to outlet end in the valve, the using method that the minority high-pressure stop valve adopts medium to enter valve body from the flap top, the medium active force is identical with the required forced draught direction of valve seal when making valve closing, therefore can stop to reveal in the valve, but valve rod place medium has increased again to the possibility of valve body external leakage (hereinafter to be referred as external leakage), so the sealability of existing stop valve is reliable inadequately, anti-leak remains a technical barrier anxious to be solved.

The purpose of this utility model provides that a kind of sealability is superior, and is simple in structure by pressure medium sealing, and long service life can be stopped the non-leakage stopping valve of internal and outernal leakage especially for duct end.

The purpose of this utility model is to be put into valve seat below by the stop valve flap is changed, and is about to former rising and opens, and the flap of closing of descending makes into to rise and closes, the flap that descends and open, and allow medium enter by the valve seat below that valve pocket realizes.

The utility model changes flap the below that is put into valve seat, and allow medium enter valve body by the valve seat below, like this when valve closing, the direction of medium active force with keep the sealing required forced draught direction identical, be that the medium active force all is converted into the forced draught to flap, and because of the lifting surface area of the utility model flap more much bigger than existing stop valve, so as long as the material that valve flap and valve seat are selected is proper, the requirement up to specification of element precision and surface roughness and assembly precision then relies on the pressure of medium self promptly to be enough to guarantee the sealing of valve.The pressure of medium raises, the forced draught of flap strengthened naturally, and the sealability reinforcement of valve, this has just stopped the internal leakage of valve from structural principle.As if the terminal that the utility model is used in pipeline, during then because of valve closing, have only the entrance point of flap below to have medium to exist, the valve rod place does not have medium, certainly no external leakage can be sayed, therefore is used in the utility model of duct end, can accomplish leakage-free valve worthy of the name.In addition; because the utility model is by medium self wiper seal; pressure medium is soft naturally; stop before going too far; damage to flap and valve seat is little, thus valve will significantly improve working life, if be used to carry then its safety of poisonous and harmful and Korrosionsmedium; reliably, few easy workout part and to help function such as environmental protection very superior.If be used to replace existing " water tap " class stop valve of widely applying, then it is that any other kind valve is incomparable at present for leak free function, the equal highly significant of its economic and social benefit.

Be described further below in conjunction with drawings and Examples:

Accompanying drawing 1 is the utility model structural representation whole-cutaway view

Among the figure: 1 handwheel, 2 Glands, 3 fillers, 4 valve gaps, 5 valve bodies, 6 valve rods, 7 sealing gaskets, 8 flaps, 9 sealing covers

As shown in the figure: the utility model is earlier valve rod (6) and flap (8) to be installed to together, and add that sealing gasket (7) back is from the auxiliary hole of valve body (5) lower end of the four-way shape valve body of packing into, in valve body (5) upper end valve gap (4) filler (3) Gland (2) and handwheel (1) etc. are installed successively then, sealing cover (9) are installed are at last waited.Valve body of the present utility model (5) is compared the bottom with existing stop valve has increased straight-run of pipe, its function is to do parking space (avoiding flap to influence the medium circulation) when descending to flap (8) and install from bottom to top for the valve seat on the processing valve body (5) and flap (8) auxiliary hole is set, valve body (5) is gone up the sealing surface of directly processing or the other valve seat of installing below middle interlayer, the sealing surface of flap (8) can directly be made with the material of favorable sealing property, also can on sealing surface, add the sealing gasket (7) that rubber or plastics are made as shown in the figure again, valve body (5) bottom tapping is installed a sealing cover (9), and its function is to guarantee that the auxiliary hole place does not have leakage.Be the closed condition of valve shown in the figure, during Open valve, need rotation hand wheel (or other transmission device rotations) to drive valve rod and move downward that flap (8) is dropped in the straight tube of valve body (5) lower end, and medium can pass through valve smoothly.

The same with existing stop valve, the utility model also can be designed and manufactured into direct current type and Angle Stop valves.

Claims (1)

1, a kind of reversing opening and closing cut-off valve, it is to improve design to finish on the basis of existing stop valve, it is characterized in that valve body lower portion has increased straight-run of pipe, a sealing cover is installed in the straight tube lower end, on the valve body directly processing or in addition the sealing surface of the valve seat of installation in valve body interlayer below, flap is below valve seat, valve wide open when valve closing when the flap rising is adjacent to sealing surface of seat, flap drop in the valve body lower end straight tube, medium must enter valve pocket from the flap below.

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