CN201672111U

CN201672111U - Double-check inverse flow preventing device

Info

Publication number: CN201672111U
Application number: CN2010201756460U
Authority: CN
Inventors: 祝云霞; 连超燕; 吕烈平; 王朝阳
Original assignee: NINGBO HUACHENG VALVE CO Ltd
Current assignee: NINGBO HUACHENG VALVE CO Ltd
Priority date: 2010-04-27
Filing date: 2010-04-27
Publication date: 2010-12-15
Anticipated expiration: 2020-04-27

Abstract

The utility model discloses a double-check inverse flow preventing device, which comprises a valve body, a water inlet ball valve and a water outlet ball valve, wherein the water inlet ball valve and the water outlet valve are arranged at both ends of the valve body, an installation cavity is formed in the valve body, and a primary check valve and a secondary check valve are sequentially arranged in the installation cavity. The utility model is characterized in that the primary check valve and the secondary check valve are in a serial connection structure, so the structure of the utility model is simple and reasonable, the assembly production is easier, in addition, the serial connection mode is adopted, the inverse flow of downstream water can be more effectively and reliably prevented, and the serial connection structure adopts the vertically crossed and mutually independent installation mode, so the maintenance or the replacement is more convenient.

Description

Two non-return backflow preventers

Technical field

The utility model relates to a kind of pair of non-return backflow preventer.

Background technique

If traditional safety check has impurity or self wearing and tearing on flap, lost efficacy easily, and owing to adopt fixedly connected, can only put in order valve after impaired upgrades, cause the wasting of resources, and traditional safety check can not prevent effectively that all press water from flowing to main and backflow phenomenon takes place from arm is counter, especially in the water supply network of Drinking Water, backflow pollution takes place the healthy of people brought serious harm, if just may there be the unsafe hidden danger of feed flow in flow.Therefore the patent No. having occurred is 200420076344.2 1 kinds of antifouling isolating valves, comprises the sealing control chamber that valve body, safety check, drain valve, sluicing valve gap and sluicing valve body are formed; Diaphragm is separated into this control chamber and independently controls epicoele and independently control cavity of resorption, is provided with first order safety check and second level safety check in its valve body; On the sluicing valve body, be provided with spilled water hole; The entrance point of described first order safety check is through the control epicoele UNICOM of pipeline and drain valve, and it exports and the import while of second level safety check and the control cavity of resorption UNICOM of drain valve; The sluicing flap is fixedlyed connected with the lower end of central shaft, fixedlys connected with diaphragm in the upper end of central shaft; Spilled water hole on the sluicing valve body makes it safe and reliable through pipeline and draining trench UNICOM, even the two-stage check valve seal lost efficacy simultaneously, also can effectively prevent the arm aqueous reflux.The defective of its existence is a complex structure, is not easy production and assembly, and the diaphragm difficulty of processing is also big, and technology is difficult to be grasped, and need further make improvements.

The model utility content

Technical problem to be solved in the utility model is the present situation at prior art, the two non-return backflow preventers that provide a kind of simple and reasonable, easy assembling to produce.

The utility model solves the problems of the technologies described above and the technological scheme that adopts is: a kind of pair of non-return backflow preventer, include valve body, water intake ball valve and water outlet ball valve, this water intake ball valve and water outlet ball valve are installed in two ends of valve body, be formed with an installation cavity in the valve body, one-level safety check and secondary safety check are housed in the described installation cavity successively, it is characterized in that: described one-level safety check and secondary safety check are cascaded structure.

As improvement, described cascaded structure adopts vertical and relatively independent installation setting.

As improvement, 2～4 test water nozzles have been threaded on the described valve body.

As improvement, described one-level safety check is identical with the structure of secondary safety check, this one-level safety check and secondary safety check have included valve gap and spool, are connected with directional post on the spool, and this directional post is pegged graft with valve gap and cooperated, valve gap is threaded with valve body, support has spring between described spool and the valve gap, has annular groove on this spool, is provided with seal ring in annular groove, have pad to utilize screw that seal ring is spacing on spool, described seal ring cooperates with valve port.

As improvement, described valve port is arranged on the valve seat, and this valve seat and valve body are one-body molded.

As improvement, it is that raw material is made that described valve gap adopts engineering plastics, and it is that raw material are made that described seal ring adopts rubber.

Compared with prior art, advantage of the present utility model is: one-level safety check and secondary safety check are connected in the installation cavity successively, make it simple and reasonable, are more prone to assembling and produce, and adopt the mode of connecting, can prevent more effectively reliably that downstream water from flowing backwards; Cascaded structure adopts vertical and relatively independent installation, it can be keeped in repair separately or change, make user's use convenient, and can also reduce maintenance cost, the test water nozzle on the valve body, can detect product on line, judge whether safety check lost efficacy, and had effectively prevented issuable potential safety hazard, and valve seat and valve body are one-body molded, make its firm stable more, prolonged working life; It is raw material that valve gap adopts engineering plastics, makes it easy to process, in light weight, and has effectively reduced cost of production, and it is raw material that seal ring adopts rubber, and it can be fitted with valve port is more effective, sealing.

Description of drawings

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

Fig. 2 is the installation diagram of three test water nozzles in the utility model.

Embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

As a kind of pair of non-return backflow preventer as described in Fig. 1～2, include valve body 1, water intake ball valve 2 and water outlet ball valve 3, this water intake ball valve 2 is installed in the feed-water end of valve body 1, water outlet ball valve 3 is installed in the waterexit end of valve body 1, described water intake ball valve 2 and water outlet ball valve 3 can be when valve be safeguarded cutting-off valve, be formed with an installation cavity in the valve body 1, connect successively in the described installation cavity one-level safety check 4 and secondary safety check 5 are housed, this one-level safety check 4 adopts vertical and relatively independent mounting type with secondary safety check 5, it can be keeped in repair separately or change, be more convenient for the user to use, described one-level safety check 4 is identical with the structure of secondary safety check 5, this one-level safety check 4 and secondary safety check 5 have included valve gap 6 and spool 7, be connected with directional post 8 on the spool 7, it is that raw material are made that described valve gap 6 adopts engineering plastics, make it easy to process, this valve gap 6 is threaded with valve body 1, the joint also is provided with O type circle 9 between valve gap 6 and valve body 1, the medium that has effectively prevented the inside is to external leakage, described valve gap 6 centers also have jack 10, this jack 10 is pegged graft with directional post 8 and is cooperated, support has spring 11 between valve gap 6 and the spool 7, make spool 7 remain the trend that seals with valve port 12, on this spool 7, have annular groove 13, in annular groove 13, be provided with seal ring 14, sealing circle 14 adopts robber materials to make, there is a pad 15 to utilize screw 16 to be fixedly mounted on the top of spool 7, this pad 15 is with seal ring 14 spacing being fixed on the spool 7, seal ring 14 and valve port 12 that above-mentioned rubber is made closely cooperate, this valve port 12 is arranged on the valve seat 17, described valve seat 17 adopts integrated mode with valve body 1, be made of one part, not only reduced cost of production, but also guaranteed the stability of using, be not easy to damage, effectively prolonged working life, three test water nozzles 18 also have been threaded on valve body 1, these three test water nozzles 18 specifically are distributed between one-level safety check 4 and the water intake ball valve 2 successively, between one-level safety check 4 and the secondary safety check 5 and between secondary safety check 5 and the water outlet ball valve 3, and being straight line distributes, described test water nozzle 18 can detect product on line, judge whether safety check lost efficacy, and had effectively prevented the potential safety hazard that may occur.

Generally, under the effect of spring force, seal ring 14 closely contacts with valve port 12 on the valve seat 17, and valve is in closed condition.When there was the medium input at water intake ball valve 2 places, the pressure at water intake ball valve 2 places overcame the spring force on one-level safety check 4 and the secondary safety check 5, opens seal ring 14, the pipeline internal medium proper flow.When water intake ball valve 2 places pressure descend, and pressure is during less than spring force or downstream pressure, under the effect of spring force or back pressure, and valve closing.

Valve of the present utility model is specially adapted to nonpotable water such as fire-fighting, irrigation the occasion that prevents the aqueous reflux requirement.

Claims

1. two non-return backflow preventer, include valve body, water intake ball valve and water outlet ball valve, this water intake ball valve and water outlet ball valve are installed in two ends of valve body, be formed with an installation cavity in the valve body, one-level safety check and secondary safety check are housed in the described installation cavity successively, it is characterized in that: described one-level safety check and secondary safety check are cascaded structure.

2. according to claim 1 pair of non-return backflow preventer is characterized in that: described cascaded structure adopts vertical and relatively independent installation setting.

3. according to claim 1 pair of non-return backflow preventer is characterized in that: 2～4 test water nozzles have been threaded on the described valve body.

4. according to claim 1 pair of non-return backflow preventer, it is characterized in that: described one-level safety check is identical with the structure of secondary safety check, this one-level safety check and secondary safety check have included valve gap and spool, be connected with directional post on the spool, this directional post is pegged graft with valve gap and is cooperated, valve gap is threaded with valve body, support has spring between described spool and the valve gap, on this spool, have annular groove, in annular groove, be provided with seal ring, have pad to utilize screw that seal ring is spacing on spool, described seal ring cooperates with valve port.

5. according to claim 4 pair of non-return backflow preventer, it is characterized in that: described valve port is arranged on the valve seat, and this valve seat and valve body are one-body molded.