CN2344613Y

CN2344613Y - Air-passed type non-return valve

Info

Publication number: CN2344613Y
Application number: CN 98238796
Authority: CN
Inventors: 刘文成
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-09-08
Filing date: 1998-09-08
Publication date: 1999-10-20
Anticipated expiration: 2008-09-08

Abstract

The utility model provides an air-passed type non-return valve used for a conveyance fluid pipeline. The utility model is mainly composed of a valve body, a valve cover, a valve flap and a guide bar matched with the upper part of the valve cover, whereon, the lower part of the guide bar is provided with a pilot sleeve, an air-passed hole which passes by the lower end of the guide bar is perforated on the guide bar, and the interior and the exterior of the valve body are communicated by the air-passed hole. The utility model solves the problems that under negative pressure, a valve gate is not tightly closed, which causes liquid backflow and water source pollution in a pipe network; at the same time, the utility model has the advantages of simple and reasonable structure, convenient use and installation, safe non-return performance, etc.

Description

Cross gas formula check valve

The utility model belongs to the valve that the conveyance fluid pipeline is used, particularly a kind of check valve that is suitable for carrying liquid.

Check valve also is safety check, is a kind of valve that relies on the pressure automatic on-off of fluid itself, is mainly used in the medium that stops in the pipeline and flows backwards.Common rise-fall type check valve mainly has the longitudinally guiding sleeve by valve body, valve gap, flap and bottom and the guide rod that matches with the top of flap is formed.When pipe network was in malleation, medium can make its normal circulation by the flap that the pressure jack-up of forward is dropped on the valve seat, can lean on the self gravitation of flap if pipe network produces negative pressure and draft that negative pressure is produced makes flap drop on throttle down on the valve seat.When negative pressure appears in pipe network, this valve can normally be closed generally speaking, but, if sealing effect is poor between flap and the valve seat, perhaps in moment that flap falls, granular impurity is by chance clamped by flap and valve seat in the conveying liquid, the not tight phenomenon of valve closing will occur, causes liquid refluence, pipe network pollution of waterhead.

The purpose of this utility model be to provide a kind of when between flap and the valve seat in case the gas formula of the crossing check valve that still can reliably stop liquid to flow backwards during the situation that occurs being not closed completely.

The purpose of this utility model is to realize like this, this is crossed, and gas formula check valve mainly has pilot sleeve by valve body, valve gap, flap and bottom and the guide rod that matches with the top of flap is formed, on guide rod, have through its lower end surface and with the air passing hole of the inside and outside connection of valve body.

The another kind of improvement of the present utility model is that the side against the guide rod lower end surface is fixed with Sealing in the bottom of flap.

Upper end and valve gap that another improvement of the present utility model is a guide rod are connected to form one, and its air passing hole passes valve gap and communicates with ambient atmosphere.

The upper end that another improvement of the present utility model is a guide rod is passed valve gap and is connected directly or indirectly with handle, and its air passing hole is by the top of guide rod or communicate with ambient atmosphere directly or indirectly on every side.

The utility model since on guide rod, have through its lower end surface and with the air passing hole of the inside and outside connection of valve body, therefore, to drop on the valve seat in case pipe network produces the negative pressure flap, the outer air of valve body will enter along the air passing hole in the guide rod in the valve body so that be full of the part pipe network simultaneously, stop the medium of user's one side to flow backwards, avoid pollution of waterhead, had the advantage of reliable check.

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is a sectional drawing of the present utility model;

Fig. 2 is the sectional drawing of the another kind of scheme of the utility model.

As shown in Figure 1, the valve of this kind structure is that single rise-fall type is crossed the gas check valve, the guide rod that mainly has pilot sleeve by valve body 6, valve gap 3 ', flap 5 and bottom and match with the top of flap 58 ' institute forms, on guide rod 8 ', have pass through its lower end surface and with the air passing hole 9 of valve body 6 inside and outside connections.Wherein the upper end of guide rod 8 ' and valve gap 3 ' are connected to form one, and its air passing hole 9 passes valve gap 3 ' and communicates with ambient atmosphere.

As shown in Figure 2, this kind structure is crossed the dual purpose valve that the circulation of vital energy in the wrong direction is ended for ending with rise-fall type, the guide rod 8 that mainly has pilot sleeve by valve body 6, valve gap 3, flap 5 and bottom and match with the top of flap 5 is formed, on guide rod 8, have pass through its lower end surface and with the air passing hole 9,81,82 of valve body 6 inside and outside connections.Wherein the upper end of guide rod 8 is passed valve gap 3 and is connected directly or indirectly with handle 1, and its air passing hole 9,81,82 is by the top of guide rod 8 or communicate with ambient atmosphere directly or indirectly on every side (guide rod at this moment just is equivalent to the valve rod in the stop valve).

As shown in Figure 1, 2, when under barotropic state, carrying liquid in order to ensure valve, liquid is unlikely to overflow valve along air passing hole 9,81,82, and the utility model can the side against the guide rod lower end surface be fixed with the Sealing 52 that is used to seal air passing hole 9,81,82 in the bottom of flap 5.In addition, can end reliably under cut-off state in order to ensure valve, the utility model also can the side against valve seat be fixed with Sealing 51 in the bottom of flap 5.

Be used for there are two kinds through the air passing hole of guide rod 8,8 ' lower end surface in the utility model: a kind of is directly to be communicated with (as the label 81,82 of Fig. 2) with the lower end surface of guide rod 8, and another kind is to be communicated with (as the label among Fig. 1,2 9) with guide rod 8,8 ' lower end surface indirectly by pilot sleeve.When air passing hole 9 directly is connected with pilot sleeve, successfully enter in valve body and the pipe network in order to ensure the air outside the valve body when flap 5 falls, the utility model can be designed to circle with the cross section of guide rod 8,8 ' middle pilot sleeve, and the cross section on flap 5 tops of matching with it is designed to polygonal (being equivalent to circle is polygonal circumcircle); Also the cross section of guide rod 8,8 ' middle pilot sleeve can be designed to polygonal, the cross section on flap 5 tops of matching with it is designed to circle (being equivalent to circle is polygonal incircle).

Of the present utility model by and the valve rod crossed in the dual purpose valve that the circulation of vital energy in the wrong direction ends of rise-fall type mainly contain two kinds with Placement between the handle: a kind of is directly to fixedly connected with handle in the upper end of valve rod, its air passing hole by valve rod top (handle is with fixing around the valve stem tip) or (around valve rod top, have a plurality of holes that communicate with air passing hole) on every side and directly communicate with ambient atmosphere, this kind valve rod is to belong to rotary valve rod, is applicable to packing seal (figure slightly) between valve rod and the valve body.Another kind is that valve rod 8 passes valve gap 3 and by screw thread be fixed on the cooperation between the lifting nut 2 on the handle 1 and be connected indirectly with handle 1, its air passing hole 9,81,82 by the top of valve rod 8 or on every side last lower through-hole 11 or lifting nut 2 through hole 21,22 on every side in the middle of the handle 1 communicate with ambient atmosphere indirectly, this kind valve rod is the plunger type valve rod, by cooperating between spacing snap ring 4 and the valve rod 8, limiting valve rod 8 can only move up and down, and is suitable for 7 sealings (as shown in Figure 2) of glue bowl between valve rod 8 and the valve body 6.

Working procedure of the present utility model is: flap is attached on guide rod 8,8 ' the lower end surface tightly at the Sealing of the disc lower end that makes flap 5 under the effect of the positive pressure of medium, contact by face and to reach reliable sealing, make medium unlikely in pilot sleeve and guide rod air passing hole and overflow.In case pipe network produces negative pressure, flap 5 will drop on the valve seat, and extraneous simultaneously air will enter valve body 6 in along guide rod 8,8 ' air passing hole and consequently be full of the part pipe network, stop the refluence of user's one side liquid.If in the normal process of using, need artificial throttle down, then can adopt structure shown in Figure 2, valve rod 8 is moved down and lower end surface by valve rod 8 heads on flap 5 and moves down by screwing handle 1, till flap 5 throttle downs; If in the time of need opening again, then make on the valve rod 8 and move by screwing handle 1, this moment, flap 5 moved up along the guide cylinder of valve rod 8 under the effect of the positive pressure of medium, and the Sealing 52 of the disc lower end by flap 5 contacts with the face of valve rod 8 end faces and reaches sealing again.

Of the present utility model cross gas formula non-return valve use install in, should be taken into account that the family is preferably lower than the height of the air passing hole of this valve with the water level of a side, in order to avoid during the generation negative pressure, the water of user's one side overflows from air passing hole. For example in the lavatory, can install and use this valve, and it can reach the purpose that replaces water tank, not only save material, and have easy for installation, time saving and energy saving, and safe and reliable, the advantages such as using water wisely.

Claims

1, a kind of gas formula check valve of crossing, the guide rod (8,8 ') that mainly has pilot sleeve by valve body (6), valve gap (3,3 '), flap (5) and bottom and match with the top of flap (5) is formed, it is characterized in that on guide rod (8,8 '), having through its lower end surface and with the air passing hole (9,81,82) of the inside and outside connection of valve body (6).

2, the gas formula check valve of crossing according to claim 1 is characterized in that air passing hole (9) directly is connected with pilot sleeve.

3, the gas formula check valve of crossing according to claim 2, the cross section that it is characterized in that pilot sleeve in the guide rod (8,8 ') is for circular, and the cross section on the flap that matches with it (5) top is a polygonal.

4, the gas formula check valve of crossing according to claim 2 is characterized in that the cross section of pilot sleeve in the guide rod (8,8 ') is a polygonal, and the cross section on the flap that matches with it (5) top is for circular.

5,, it is characterized in that the side against guide rod (8,8 ') lower end surface is fixed with Sealing (52) in the bottom of flap (5) according to claim 1,2, the 3 or 4 described gas formula check valves of crossing.

6, according to claim 1,2, the 3 or 4 described gas formula check valves of crossing, it is characterized in that the upper end of guide rod (8 ') and valve gap (3 ') are connected to form one, its air passing hole (9) passes valve gap (3 ') and communicates with ambient atmosphere.

7, according to claim 1,2, the 3 or 4 described gas formula check valves of crossing, the upper end that it is characterized in that guide rod (8) is passed valve gap (3) and directly is connected with handle (1), and its air passing hole (9) is by the top of guide rod (8) or directly communicate with ambient atmosphere on every side.

8, according to claim 1,2, the 3 or 4 described gas formula check valves of crossing, valve gap (3) is passed and by screw thread be fixed on the cooperation between the lifting nut (2) on the handle (1) and be connected indirectly with handle (1) in the upper end that it is characterized in that guide rod (8), its air passing hole (9,81,82) by the top of guide rod (8) or on every side last lower through-hole (11) or the lifting nut through hole (21,22) on every side in the middle of the handle communicate with ambient atmosphere indirectly.