CN2403969Y

CN2403969Y - Two-way check valve

Info

Publication number: CN2403969Y
Application number: CN 99255217
Authority: CN
Inventors: 杨秀文
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-11-26
Filing date: 1999-11-26
Publication date: 2000-11-01
Anticipated expiration: 2009-11-26

Abstract

The utility model relates to a two-way check valve. The appearance of the two-way check valve forms a tee shape. The horizontally left and the right two ends of the two-way check valve are respectively provided with a check valve which can move in parallel. A valve rod can be provided with a guide sleeve, and can also be provided without the guide sleeve. One end or two ends of the valve rod are supported in the guide sleeve. The parallel-moving check valve is composed of a valve body, a valve plate, the valve rod, a support frame and a spring as the usual method. The utility model is characterized in that the spring can move left and right; one end of the front guide sleeve can be provided with a small hole, which causes the valve to slowly close and eliminate water hammer. The utility model has the advantages that the structure is simple, the manufacture is convenient, one valve can replace two check valves, two stop valves, two backwater automatic valves, a steel short joint of a lead-out opening, and a tee, and reduces the original material cost and the service charge of installation and repair.

Description

Dual way check valve

The utility model relates to a kind of dual way check valve.

Safety check can be divided into rotary-open type and rise-fall type (process pipe installation and design handbook, the 3rd piece of valve, in January, 1991, Sinopec publishing house) by the motion mode classification of its valve plate, and these safety check are contained on the pipeline, use mostly separately.In not having pressure or pressure boiler heating system, the outlet of two water pumps is adorned two gate valves of two safety check and is coupled together with pipeline and flange, switches to use.This Placement is given installation and is used and make troubles.There is water hammer in various degree in this valve in the moment of cutting out in addition, particularly large diameter safety check, and this water hammer can cause damage to pump and pipe fitting, pipeline.For eliminating water hammer, in safety check, increased Slow Close mechanism, as CN93240166.X, CN93229936.9, CN85202944, CN2088626U etc., these Slow Close mechanisms are quite complicated, that have even also more complicated than the mechanism of safety check itself, it has increased cost, and is also not too reliable.

The purpose of this utility model is to develop a kind of dual way check valve that boiler heating system is installed easy switching and do not had water attack that is used for.

Major technique feature of the present utility model is that establishing two can parallel mobile safety check and two backwater self-acting valve control valve drawing-off mouth at the straight-through two ends of the level of threeway.

Embodiment's accompanying drawings of the present utility model is as follows:

Fig. 1 is the utility model embodiment 1 a structural representation.

Fig. 2 is the utility model embodiment 2 a structural representation.

Fig. 3 is the utility model embodiment 3 a structural representation.

Fig. 4 is the utility model embodiment 4 a structural representation.

As shown in the figure, 1 is back poppet, and 2 is holddown spring, and 3 is set screw nut, 4 is pressing plate, and 5 is the elastic packing offset plate, and 6 is O type seal ring, and 7 is backwater self-acting valve control valve drawing-off mouth, 8 is flange, and 9 is the rigidity snap ring, and 10 is pad, 11 is leading to stock, and 12 is preceding guide sleeve, and 13 is aperture, 14 is valve rod, and 15 is fixing pin, and 16 is water out, 17 is the back guide sleeve, and 18 is pad, 19 nuts.

Embodiment 1

As shown in Figure 1, profile is a threeway that has standard flange, the right and left of substantially horizontal is respectively adorned a horizontal moving type safety check, spring 2 one ends of this valve are stuck on the support 1, the other end is stuck on the valve plate of

parts

3,4,5,14 formations, valve plate is given on the valve port that is pressed on preceding leading truck 11 the inners by spring 2, the sealing that O type ring 6 is used between leading truck 11 and the valve body, rigidity snap ring 8 is used for support 11 is stuck in valve body, behind starting of pump station, the water pressure pushing valve plate is with length of spring compressed, and safety check is opened; After water pump stops, by the elastic force of spring and the position pressure of water described valve plate being pressed on the valve port, switch is flexible, and sealing is reliable.

Embodiment 2

As shown in Figure 2, the left end of valve rod 14 is prolonged, penetrate in the guide sleeve 17 of back, when described valve plate move left and right, guarantee valve plate always in the position at axle center, other are with embodiment 1.

Embodiment 3

Shown in 3, embodiment 1 back poppet is saved, preceding guide sleeve 12 is passed in the prolongation of the right-hand member of valve rod 14, there is screw thread the right part of valve rod 14, spring 2 is stuck on preceding guide sleeve 12 external diameters, penetrates a compressing tablet 18, spring 14 is compressed with nut 19 from valve rod 14 right-hand members, when safety check was opened, spring 14 was compressed; When pump stopped, safety check cut out by the elastic force of spring and the position pressure of water.The advantage of this technological scheme is that spring is convenient to Field adjustment, maintenance, replacing in the outer end.Other are with embodiment 1.

Embodiment 4

As shown in Figure 4, the position, axle center of embodiment 1 support 1 is provided with postpone guide sleeve 17, valve rod 14 is prolonged left, penetrate in the guide sleeve 17 of back; Valve rod 14 is prolonged to the right, in the preceding guide sleeve 12 before penetrating on the leading truck 11, the left end of preceding guide sleeve 12 has an aperture 13, when valve rod 14 moves to left, water enters in the cover 12 from aperture 13, when valve rod after the unexpected termination of pumping moves to right when closing, the water in the cover 12 slowly flow out from aperture 13, and safety check slowly cuts out.Present embodiment is erected two ends, valve rod 14 left and right sides, guarantees the translation of valve plate vertical axial, and aperture 13 makes the valve can slow open and close, thus the water hammer when having eliminated closure of check ring.This structure has conspicuous advantage for large-sized safety check, and it can avoid water hammer, guarantees the translation of valve plate vertical center axis.Other structures are with embodiment 1.

Claims

1. dual way check valve, constitute by valve body, valve plate, valve port, valve rod, support and spring, spring bracket is before support and valve plate, spring gives valve plate to be pressed on and constitutes automatic check valve on the valve port, it is characterized in that described dual way check valve profile is the threeway shape, two ends, the level left and right sides respectively adorn one can translation safety check.

2. dual way check valve as claimed in claim 1 is characterized in that respectively establishing between the valve plate of left and right sides safety check and the adpting flange drawing-off mouth of a backwater self-acting valve control valve.

3. safety check as claimed in claim 1 or 2 is characterized in that setting up back guide sleeve (17), and valve rod (14) prolongation is penetrated wherein.

4. safety check as claimed in claim 1 or 2 is characterized in that, saves back poppet (17), valve rod (14) prolongation is penetrated in the preceding guide sleeve (12), the right-hand member of valve rod has screw thread and nut, and guide sleeve was outer through last before spring (2) was stuck in, and gave holddown spring (2) with pad (18).

5. safety check as claimed in claim 1 or 2, base are characterised in that and will prolong before and after the valve rod (14) that frame is on preceding guide sleeve (11) and back guide sleeve (17) simultaneously, and the outer end of preceding guide sleeve (11) is provided with aperture (13).