CN2346997Y

CN2346997Y - Check valve

Info

Publication number: CN2346997Y
Application number: CN 98214904
Authority: CN
Inventors: 赵林春
Original assignee: YONGJIA COUNTY BOILER COMPLETE VALVE PLANT
Current assignee: YONGJIA COUNTY BOILER COMPLETE VALVE PLANT
Priority date: 1998-05-28
Filing date: 1998-05-28
Publication date: 1999-11-03
Anticipated expiration: 2008-05-28

Abstract

The utility model relates to a check valve, composed of a main valve, a control check valve for controlling the film cavity of the main valve and a hollow communicating pipe. The valve clack of the main valve is positioned at the outlet side of a valve seat and linked with a diaphragm in a coaxial mode, and the valve clack is automatically opened and closed through fluid pressure. The pressure of the film cavity is slowly increased in the process of check to prevent the generation of water hammering, so that the utility model has the advantages of flexible opening and closing, long service life, reliable work, etc. The utility model is especially suitable for being installed in conduit pipelines to control the unidirectional flow of water flow.

Description

Safety check

The utility model relates to a kind of valve, specifically about a kind of safety check.The utility model is applicable to the unidirectional conveying of controlled water flow in the waterline.

The safety check that domestic production is used mainly contains two kinds, and a kind of is rise-fall type, and another kind is a rotary-open type, these two kinds of safety check manufacture costs are lower, applied range, and its deficiency is to need bigger reverse pressure when closing, service time is when longer, flap and rotating shaft meeting incrustation thereof get rusty, and it is dumb that flap is opened, can not return or be not closed completely, do not have the non-return seal action, it is unreliable to work, and the water hammer that produces when cutting out has bigger impact force to flap, influences the working life of product.

The purpose of this utility model is that a kind of keying of design is flexible, the safety check of reliable operation, long service life.

The technical solution of the utility model is made up of the safety check of a main valve and the keying of a control main valve, the flap of main valve is positioned at the valve seat outlet side, and in the coaxial installation of diaphragm, form interlock, pressing diaphragm is contained between valve seat and the valve gap, constitutes a film chamber with valve gap, and the valve body import is communicated with the control check valve inlet, outlet is communicated with the film chamber, and the outlet of control safety check is communicated with the film chamber.

The utility model beneficial effect compared with prior art is: control bigbore pipeline fluid with small-bore safety check, the keying of flap is controlled automatically by flowing medium fully, opens and closes flexibly; The pressure in film chamber slowly increases in the non-return process, has prevented the generation of hammer, improves product working life; Under the situation of diaphragm breakage, have non-return effect, reliable operation equally.

Fig. 1 is the utility model principle schematic.

Fig. 2 is the utility model main valve structure sectional view.

Now describe embodiment of the present utility model in conjunction with the accompanying drawings in detail.

Safety check shown in Figure 1 is by main valve, control safety check 13, needle-valve 15, throttle pipe 14, ball valve 16 and constitute hollow connecting tube, the import and export of control safety check 13 are communicated with main valve import and film chamber by hollow tubular respectively, with being communicated with of main valve import a needle-valve 15 are housed on the hollow tubular in 13 imports of control safety check.The main valve outlet is communicated with by hollow tubular with the film chamber, and throttle pipe 14 and ball valve 16 are being adorned in series connection on the hollow tubular of between.The hollow tubular latus rectum is 4 millimeters.Main valve shown in Figure 2 is made up of valve body 7, valve seat 1, flap 8, valve gap 1, diaphragm 6, diaphragm pressing plate 3, spring 2 and assembling set and Sealing, flap 8, diaphragm 6, diaphragm pressing plate 3, spring 2 coaxial being contained on the axle 12, flap 8 is positioned at valve seat 11 outlet sides, form normally closed structure with valve seat 11, seal ring 9 is housed at the valve seat outlet side.Diaphragm 6 middle parts are pressed between flap 8 and the diaphragm pressing plate 3, are fitted in all around between valve body 7 and the valve gap 1, and valve body 7 is fastening by spiral shell inspection 4 and nut 5 with valve gap 1.

Claims

1, a kind of safety check, it is characterized in that having the control safety check (13) of a main valve and a control main valve film cavity pressure to constitute, the flap of main valve (8) is positioned at valve seat (11) outlet side and diaphragm (6) is fixed on the axle (12) simultaneously, diaphragm (6) is fitted between valve seat (7) and the valve gap (1) all around, with valve gap (1) structure film forming chamber, valve body (7) import is communicated with the import of control safety check (13), and outlet is communicated with the film chamber, and control safety check (13) outlet is communicated with the film chamber.

2, be communicated with by hollow tubular between the safety check according to claim 1, the outlet that it is characterized in that described valve body (7) and film chamber, throttle pipe (14) is housed in the middle of the hollow tubular.