CN201106684Y

CN201106684Y - Stop check valve

Info

Publication number: CN201106684Y
Application number: CNU2007201264182U
Authority: CN
Inventors: 陈清流; 裴耀贵; 乐精华; 董霞
Original assignee: LANZHOU HIGH PRESSURE VALVE CO Ltd
Current assignee: LANZHOU HIGH PRESSURE VALVE CO Ltd
Priority date: 2007-11-01
Filing date: 2007-11-01
Publication date: 2008-08-27
Anticipated expiration: 2017-11-01

Abstract

The utility model provides a stop check valve which comprises an executing mechanism, a valve handle, a valve clack, a valve cover and a valve body; the stop check valve is characterized in that: the center of the valve clack is provided with a valve handle sleeve which is clearance fit with the valve handle. The stop check valve not only has the function of a disconnecting valve, but also has the function of a check valve, and reasonably and skillfully integrates the two valves into a whole; when the executing mechanism lifts the valve handle, the valve is equivalent to the check valve, and the opening and closing movement of the valve clack is determined by the flow direction of actuating medium; when the medium is in a fair current state, the medium drives the valve clack to open upwards and the valve is opened; when the medium is in a reverse current state, the valve clack falls back downwards under the action of the medium to lead the valve to be closed. When the executing mechanism compresses the valve handle on the valve clack, the valve is equivalent to the disconnecting valve, so as to prevent the medium from flowing into the valve. The stop check valve has the characteristics of compact structure, flexible opening, reliable performance and convenient operation, etc., and can be widely applied in the devices such as petrochemical industry and chemical engineering fertilizer, metallurgy and electrical power, etc.

Description

Screw down nonreturn valve

Technical field the utility model belongs to the mechanical valve class, specifically a kind of novel valve that stop valve and safety check are integrated.

In the maximization devices such as modern petrochemical industry of background technique and chemical industry chemical fertilizer, metallurgy, electric power, requiring used valve inevitable also is heavy caliber, and according to the difference of valve function, generally not only need to install stop valve, but also needed to install safety check, can make device volume huge like this, workman's inconvenient operation.

The summary of the invention the purpose of this utility model is to provide a kind of stop valve and safety check is integrated, and easy to operate novel screw down nonreturn valve.

For achieving the above object, the technological scheme taked of the utility model is:

A kind of screw down nonreturn valve comprises actuator, valve rod, flap, valve gap and valve body, it is characterized in that:

Described flap central authorities are provided with a valve stem casing, Spielpassung between described valve rod and the valve stem casing.

Described flap bottom is provided with a guide rod, guide rod and valve seat guide ring Spielpassung.

The inherent flap lifting of described valve body district is provided with guiding rib, and guiding rib cooperates with the flap marginal gap.

Described flap top inwardly concaves, the uniform spoke-like stiffening rib in recessed position.

Described flap bottom side is provided with the hydrops tap hole.

Described actuator selects the manual actuator of umbrella gear for use.

The above-mentioned screw down nonreturn valve that the utility model provides had both had the function of stop valve, had the function of safety check again, rationally dexterously two kinds of valves was united two into one, and compact structure is opened flexibly, and reliable performance is easy to operate.

Description of drawings Fig. 1 is embodiment's a structural representation

Fig. 2 is the A-A sectional view of Fig. 1

Among the figure: the 1-handwheel; The 2-umbrella gear box; The 3-valve gap; The 4-valve body; The 5-valve rod; The 6-guiding rib; The 7-valve stem casing; The 8-flap; The 9-guide ring; The 10-guide rod; The 11-stiffening rib.

Embodiment such as Fig. 1 are to shown in Figure 2, among the screw down nonreturn valve embodiment that the utility model provides, this screw down nonreturn valve is selected the manual actuator of umbrella gear for use, comprise handwheel 1 and umbrella gear box 2, the manual actuator of umbrella gear drives coupled valve rod 5, valve rod 5 passes valve gap 3 and extend in the valve body 4, valve gap 3 is fixedlyed connected with valve body 4, innovation part of the present utility model is: the central authorities at flap 8 establish a valve stem casing 7, valve stem casing 7 can be an integrative-structure with flap 8, also can be the branch body structure, is Spielpassung between valve rod 5 and the valve stem casing 7, this structural design can make valve rod 5 and flap 8 can close and can divide, and a valve has both two valve functions.

Do not depart from when moving up and down, guarantee the valve seal performance for assurance flap 8, especially for large bore valves, as: Class 150LB DN600 is provided with a guide rod 10, guide ring 9 Spielpassung on guide rod 10 and the valve seat in the bottom of flap 8.As a same reason, flap lifting district is provided with guiding rib 6 in valve body 4, cooperates with flap 8 marginal gaps.

For alleviating the weight of flap 8, to guarantee to open flexibly, the top of flap 8 is invaginated type (hollow flap), the uniform spoke-like stiffening rib 11 in recessed position.For the top that prevents flap 8 is recessed into the weight that the position hydrops increases flap 8, the bottom side of flap 8 is provided with the hydrops tap hole.Present embodiment Class 150LB DN600 when working pressure only is 0.02MPa, just can open flap 8 like a cork as safety check.

The working principle of the screw down nonreturn valve that the utility model provides: when the handwheel 1 drive umbrella gear box 2 of manual actuator is mentioned valve rod 5, this moment, this valve was equivalent to safety check, the keying campaign of closure member flap 8 is decided with the flow direction of working medium, medium promotes to open valve opening on the flap 8 during the medium following current; Flap 8 falls after rise downwards under the medium effect during medium counter flow, makes valve closing.When the handwheel 1 drive umbrella gear box 2 of manual actuator was pressed on valve rod 5 on the flap 8, this moment, this valve was equivalent to stop valve, stoped the inflow of medium.

Above-described only is preferred embodiment of the present utility model.Should be understood that for the person of ordinary skill of the art, under technology enlightenment provided by the utility model, can also make other equivalent modifications and improvement, also should be considered as protection domain of the present utility model.

Claims

1, a kind of screw down nonreturn valve comprises actuator, valve rod, flap, valve gap and valve body, it is characterized in that: described flap central authorities are provided with a valve stem casing, Spielpassung between described valve rod and the valve stem casing.

2, screw down nonreturn valve according to claim 1 is characterized in that: described flap bottom is provided with a guide rod, guide rod and valve seat guide ring Spielpassung.

3, screw down nonreturn valve according to claim 1 and 2 is characterized in that: the inherent flap lifting of described valve body district is provided with guiding rib, and guiding rib cooperates with the flap marginal gap.

4, screw down nonreturn valve according to claim 1 and 2 is characterized in that: described flap top inwardly concaves, the uniform spoke-like stiffening rib in recessed position.

5, screw down nonreturn valve according to claim 4 is characterized in that: described flap bottom side is provided with the hydrops tap hole.

6, screw down nonreturn valve according to claim 1 is characterized in that: described actuator selects the manual actuator of umbrella gear for use.