CN2519078Y

CN2519078Y - Self-controlled slow-closing butterfly-type check valve

Info

Publication number: CN2519078Y
Application number: CN 01225786
Authority: CN
Inventors: 项石; 吴汉民
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-05-20
Filing date: 2001-05-20
Publication date: 2002-10-30
Anticipated expiration: 2011-05-20

Abstract

The utility model relates to a self-controlled slow-closing butterfly-type check valve which includes a valve body, a valve base, a valve rod, a butterfly plate, a torsion spring, a self-controlled slow closure resisting system, etc. The valve base, the valve rod and a torsion spring shaft are connected with the valve body, and the butterfly plate is connected with the valve rod. The torsion spring are arranged on the valve rod, with one end connected with the torsion spring shaft and the other end clamped on the butterfly plate. The self-controlled slow closure resisting system consists of a cylinder body, a filter, a valve plate, a piston, a vibration reducing mat, etc. and is arranged at the inlet of the valve, with the filter, the valve plate, the piston and the vibration reducing mat orderly arranged in the cylinder body. The self-controlled slow closure resisting system can relieve the attack of the water and achieve the aim of pipe protection through the automatic slow closing of the butterfly plate. The butterfly-type check valve is simple in structure, small in volume, long in service life, low in noise production, convenient in assembly and safe and energy saving.

Description

Self-controlled type micro-resistance slowly-closed butterfly check valve

The utility model relates to butterfly check valve, particularly a kind of self-controlled type micro-resistance slowly-closed butterfly check valve.

At present; the butterfly check valve micro-resistance slowly-closed system of the common use in home and abroad all has hydraulic system and Slow Close regulating system two-part to constitute; its pipeline interface is many; complex structure; long-term use causes very easily that hydraulic oil leaks, the Slow Close modulating valve damages or is malfunctioning; thereby butterfly plate is closed rapidly under the state that has no the Slow Close protection, can cause pipeline burst when serious, fracture.In addition, hydraulic pressure Slow Close system architecture is huge, complicated, coarse, heavy, and difficulty is installed in cost height, transportation inconvenience.

It is a kind of simple in structure that the utility model purpose just is to provide, and can realize the micro-resistance slowly-closed function voluntarily, safe and reliable self-controlled type micro-resistance slowly-closed butterfly check valve.

The utility model purpose is achieved in that

This self-controlled type micro-resistance slowly-closed butterfly check valve is made up of valve body, valve seat, valve rod, butterfly plate, torsion axis, torsion spring, automatic control micro-resistance slowly-closed system etc., valve seat, valve rod, torsion axis link to each other with valve body, butterfly plate links to each other with valve rod, and torsion spring one end is connected on the torsion axis, and the other end is clamped on the butterfly plate; Automatic control micro-resistance slowly-closed system is two groups, be fixedly mounted on the horizontal position on body cavity entrance point both sides, this system is the plug check valve structure, constitute by cylinder body, filter, piston, beam etc., its cylinder body links to each other with valve body, be provided with some discharge capacity apertures on cylinder body, filter, valve plate, piston, beam etc. are installed in the cylinder body.When media flow enters butterfly check valve; when opening butterfly plate; medium is also opened plug check valve through the filter of automatic control micro-resistance slowly-closed system cylinder body front end; promoting piston goes to cylinder is overhanging; when pumping plant quits work; butterfly plate is finished under the effect of torsion spring and is just resetted; under the promotion of medium refluence power; when butterfly plate closes to 2/3 place; touch the beam of piston crown, and then promote piston and shrink back, make automatic control micro-resistance slowly-closed system closure of check ring; at this moment; medium in the oil hydraulic cylinder can only be extruded from a plurality of discharge capacity holes that differ in size, because piston is shunk back by slack-off soon, causes butterfly plate slowly to close; so just can eliminate the destruction of water hammer power, the protection pipe safety.

Advantage of the present utility model is: because automatic control micro-resistance slowly-closed system directly utilizes the effect of medium power to realize opening and closing, and then realize the micro-resistance slowly-closed of butterfly check valve automatically, original complexity, huge hydraulic pressure Slow Close system have been cancelled, make the butterfly check valve volume reduce, simple in structure, easy for installation, wear-resistant, open and close steady, shockproof, low noise, flow resistance is little, discharge capacity is big, the life-span is long, energy-saving safe.

Be described further below in conjunction with drawings and Examples:

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

Fig. 2 is the torsion spring structural representation before improving;

Fig. 3 is the utility model torsion spring structural representation.

Valve seat 2 is fixed on the valve body 1, makes Sealing usefulness, and valve rod 4 passes valve body 1 shell and is connected on the valve body 1, and butterfly plate 3 is a rotary opening and closing spare, is made up of two semi-circular plates, is installed on the valve rod 4; Torsion axis 5 is connected on the valve body 1, torsion spring 6 is two assemblies, with pad 7 is the both sides that the center is contained in valve rod 4 respectively, torsion spring 6 one ends are fixedly connected on the torsion axis 5, the other end contacts with butterfly plate 2 and is clamped on the butterfly plate face, because torsion spring opens and closes with butterfly plate and takes regular exercise, and very easily fractures, the utility model torsion spring has structurally been done improvement, as Fig. 2, shown in Figure 3, improve preceding 12,13 places very easily fracture, and 14 places and butterfly plate plane contact easily form the cutting friction, and be also fragile, the utility model torsion spring and valve rod stretch out place 15 and are secant-shaped, bending part, stage casing 16 is made circular-arc, makes circular arc 17 with the butterfly plate contacting point, is a contact, only form the some friction like this and between butterfly plate, because the improvement at above-mentioned three places causes torsion spring not frangibility and damage, has prolonged working life; Automatic control micro-resistance slowly-closed system is the plug check valve structure, have two groups, lay respectively on the horizontal position of body cavity entrance point, its cylinder body 8 is an integrally casting with valve body 1, on cylinder body 8, make a plurality of metering orifices that differ in size 12, filter 9, valve plate 10, piston 11, beam 13 are installed in the safety check inner chamber of cylinder block according to the entrance point sequencing.

Claims

1, self-controlled type micro-resistance slowly-closed butterfly check valve, form by valve body, valve seat, valve rod, butterfly plate, torsion axis, torsion spring, automatic control micro-resistance slowly-closed system etc., it is characterized in that: valve seat (2), valve rod (4), torsion axis (5) are connected with valve body (1), butterfly plate (3) is connected with valve rod (4), torsion spring (6) is installed on the valve rod (4), one end is connected with torsion axis (5), and the other end is clamped on the butterfly plate (3); Automatic control micro-resistance slowly-closed system is two groups, is fixedly mounted on the horizontal position on body cavity entrance point both sides, and its cylinder body (8) is connected with valve body (1).

2, self-controlled type micro-resistance slowly-closed butterfly check valve according to claim 1, it is characterized in that: described automatic control micro-resistance slowly-closed system, form by cylinder body, filter, valve plate, piston, beam etc., make a plurality of metering orifices that differ in size (12) on cylinder body (8), filter (9), valve plate (10), piston (11), beam (13) are installed in cylinder body (8) inner chamber according to the entrance point sequencing.

3, self-controlled type micro-resistance slowly-closed butterfly check valve according to claim 1, it is characterized in that: described torsion spring (6) and valve rod (4) stretch out place (15) and are secant-shaped and stretch out, bending part, stage casing (16) is made circular-arc, is with butterfly plate (3) contacting point (17) to contact.