CN201606549U - Non-return stop valve - Google Patents

Abstract

The utility model discloses a non-return stop valve which comprises a valve body, a valve core, a valve rod and a valve cap, and is characterized in that one end of an adjusting piece is embedded into the top wall of the valve cap; the middle part of the adjusting piece is provided with a sliding cavity, in which the valve rod can slide; an offsetting spring is positioned between the top of the valve rod and the sliding cavity; and the valve rod is connected with the valve core by riveting. The non-return stop valve has simple structure and good non-return effect, and effectively prevents secondary pollution.

Description

The non-return stop valve

Technical field

The utility model relates to a kind of non-return stop valve.

Background technique

In traditional hot water service pipeline or supply air line, there are some to need stop valve to cut off, need to prevent the occasion of medium back flow again, because stop valve and safety check will be installed simultaneously, installing space is big, pipe interface is many, causes complexity is installed, and leakage point is many, therefore the patent No. having occurred is 93211219.6 1 kinds of rise-fall type non-return stop valves, it is characterized in that sliding bar is arranged at spool top, sliding bar and valve rod lower end sliding cavity are slidingly matched, and make two kinds of functions that the utlity model has stop valve and safety check, have simple in structure, easy to maintenance, characteristics such as simple to operate, its shortcoming is, because utilizing the sliding cavity of the sliding bar on spool top and valve rod lower end to cooperate ends and non-return, therefore its non-return weak effect may cause secondary pollution, needs further to improve.

The model utility content

Technical problem to be solved in the utility model is the present situation at prior art, provide a kind of simple in structure, non-return is effective, effectively prevent the non-return stop valve of secondary pollution.

The utility model solves the problems of the technologies described above and the technological scheme that adopts is: a kind of non-return stop valve, comprise valve body, spool, valve rod and bonnet, it is characterized in that: have an adjusting element one end to be embedded in the roof of bonnet, the middle part of this adjusting element has the sliding cavity for valve stem slides, have a Returnning spring to be arranged between valve rod top and the sliding cavity, valve rod links to each other with spool on the valve port.

As improvement, be riveted joint between described spool and the valve rod underpart, and be provided with a gasket seal.

As improvement, described adjusting element is threaded in the valve gap, and the valve gap screw thread is fixed in the valve body.

As improvement, two ends, the described valve body left and right sides joint that all has been threaded.

Compared with prior art, advantage of the present utility model is: have a Returnning spring to be arranged between valve rod top and the sliding cavity, when outlet pressure during greater than inlet pressure, at pressure and under the effect of Returnning spring power, spool contacts with valve seat fast, valve closing effectively prevented backflow and secondary pollution, and it is simple in structure, easy to assembly, be provided with a gasket seal between spool and the valve rod underpart, the sealing pad can prevent that spool from frequently rising and close, and causes loosening or come off.

Description of drawings

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

Fig. 2 is the cutaway view Amplified image of adjusting element;

Fig. 3 is the plan view of adjusting element;

Fig. 4 is for being the worm's eye view of adjusting element;

Fig. 5 is the cutaway view Amplified image of valve gap;

Fig. 6 is the plan view of valve gap;

Fig. 7 is the cutaway view Amplified image of bonnet;

Fig. 8 is the stereogram of bonnet;

Fig. 9 is the plan view of bonnet;

Figure 10 is the worm's eye view of bonnet;

Figure 11 is the structure sectional view of mangetic core assembly.

Embodiment

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

As a kind of non-return stop valve as described in Fig. 1～11, comprise valve body 1, spool 2, valve rod 3 and bonnet 4, the two ends, the left and right sides of valve body 1 joint 5 that all has been threaded, there are an adjusting element 6 one ends to be embedded in the roof of bonnet 4, the Embedded Division 7 of this adjusting element 6 is cross, this cross Embedded Division 7 protrudes on adjusting element 6 tops, have in the roof of bonnet 4 and cross Embedded Division 7 corresponding cross type grooves 8, the middle part of adjusting element 6 has the sliding cavity 9 that slides for valve rod 3, have two annular grooves 10 in correspondence with each other up and down at adjusting element 6, be built-in with O type circle 11 at annular groove 10, this adjusting element 6 is threaded in the valve gap 12, described O type circle 11 closely contacts with valve gap 12, these valve gap 12 screw threads are fixed in the valve body 1, above valve body 1 and valve gap 12 threaded joints is the annular cavity 13 of valve gap 12, in annular cavity 13, also be provided with O type circle 11, this O type circle 11 fits tightly with valve body 1, between valve rod 3 tops and sliding cavity 9, be provided with a Returnning spring 14, valve rod 3 links to each other with spool 2 riveted joints, between valve rod 3 underparts and spool 2, also be provided with a gasket seal 15, sealing pad 15 prevents that effectively spool 2 from using for a long time and generation is loosening, sealing pad 15, spool 2 and valve rod 3 constitute an overall mangetic core assembly 17, top end at bonnet 4 also is provided with nameplate 16, make it not only have aesthetic feeling, can also promote class.

Technical requirements of the present utility model, described adjusting element 6 are white, and bonnet 4 and gasket seal 15 are black, adjusting element 6 and valve gap 12 need go to institute jagged when making, gasket seal 15 must not have overlap, should clean each part before assembling, must not have any impurity to bring in the valve body 1.

Working principle of the present utility model is further described:

Under normal circumstances, the rotation of bonnet 4 can be regulated the height of adjusting element 6, thereby the aperture of control spool 2 and valve seat also can be cut off pipeline, and this time, it played stop valve; When outlet pressure during greater than inlet pressure, and under the effect of Returnning spring 14 power and spool 2 deadweights, spool 2 closely contacts with valve port, valve closing, and it plays safety check at this moment.

Claims (4)

1. non-return stop valve, comprise valve body, spool, valve rod and bonnet, it is characterized in that: have an adjusting element one end to be embedded in the roof of bonnet, the middle part of this adjusting element has the sliding cavity for valve stem slides, have a Returnning spring to be arranged between valve rod top and the sliding cavity, valve rod links to each other with spool on the valve port.

2. non-return stop valve according to claim 1 is characterized in that: be that riveted joint is connected between described spool and the valve rod underpart, and be provided with a gasket seal.

3. non-return stop valve according to claim 1 is characterized in that: described adjusting element is threaded in the valve gap, and the valve gap screw thread is fixed in the valve body.

4. non-return stop valve according to claim 1 is characterized in that: two ends, the described valve body left and right sides joint that all has been threaded.

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