CN202349302U

CN202349302U - Piston type emergency stop valve

Info

Publication number: CN202349302U
Application number: CN2011204831218U
Authority: CN
Inventors: 王孝伟; 阳胜军
Original assignee: Shanghai Huiyi Control System Co Ltd
Current assignee: Shanghai Huiyi Control System Co Ltd
Priority date: 2011-11-29
Filing date: 2011-11-29
Publication date: 2012-07-25
Anticipated expiration: 2021-11-29

Abstract

The utility model relates to a piston type emergency stop valve, which solves the problem that the emergency stop action is ensured while facilitating maintenance and reducing cost. The valve comprises a valve body, a valve cap and a valve base respectively covered at the upper end and the lower end of the valve body, and a piston mounted in the valve body, wherein the piston is connected with the valve base through a spring, and an upper way control oil port communicated with the top surface of the piston is arranged on the valve cap; a lower way oil passage and a valve stem connecting hole communicated with the lower way oil passage are arranged on the valve base, a valve stem for controlling the connection/disconnection of the lower way oil passage is arranged in the valve body, the upper end of the valve stem is fixedly connected with the piston, and the lower end of the valve stem passes through the valve stem connecting hole in a movable connection way to extend into the lower way oil passage; the number of the spring is one, the spring is coaxially sheathed on the valve stem, the upper end of the spring is butted against the piston, and the lower end of the spring is butted against the valve base; and the valve stem and the wall of the valve stem connecting hole are sealed through a dust sealing ring and a YX type sealing ring. The emergency stop valve provided by the utility model is convenient for maintenance and has low manufacturing cost.

Description

A kind of piston type crisis intercepter valve (IV)

Technical field

The utility model relates to the valve technology, particularly relates to a kind of technology of piston type crisis intercepter valve (IV).

Background technique

The crisis intercepter valve (IV) is thermal power plant, nuclear power plant when breaking down at the low voltage control oil circuit of setting out on a journey, and is used to unload the oil pressure that falls down road high-pressure system oil circuit, and the blocking-up steam valve makes a kind of Protective valve of steam turbine emergency shutdown.

The working pressure of control oil channel all is ultra low pressure (0.15Mpa) owing to set out on a journey; Therefore traditional crisis intercepter valve (IV) all adopts diaphragm type structure; Change so that respond the oil pressure of the control oil channel of setting out on a journey fast, the crisis intercepter valve (IV) of this diaphragm type structure is safeguarded very inconvenient, and manufacture cost is high.

In addition, also have part crisis intercepter valve (IV) to adopt the piston cylinder operator of easy to maintenance and low cost of manufacture, the valve rod and the junction plane between the valve seat of the crisis intercepter valve (IV) of existing piston cylinder operator are sneaked into dust easily; Can cause the valve rod bite; After operating time is long, can not make response fast, so many spring control pistons answers need be set in the valve body; Its operating accuracy is lower; Under the ultralow operating conditions of the control oil channel working pressure of setting out on a journey, can not play the effect of crisis blocking, do not set up in the control oil channel of setting out on a journey under the state of working pressure yet can't good debug under the road system oil-way.

The model utility content

To the defective that exists in the above-mentioned existing technology; The utility model technical problem to be solved provides a kind of easy to maintenance, low cost of manufacture; Under the ultralow operating conditions of the control oil channel working pressure of setting out on a journey, also can guarantee the piston type crisis intercepter valve (IV) of its crisis blocking effect.

In order to solve the problems of the technologies described above, a kind of piston type crisis intercepter valve (IV) that the utility model provided comprises valve body; And be sealed on the valve gap of valve body upper end; Be sealed on the valve seat of valve body lower end, be installed in the body cavity along valve body piston in axial sliding, the periphery of said piston is connected with the inner wall sealing of valve body; And through spring connection valve seat, said valve gap is provided with the control port of setting out on a journey that is communicated with piston-top surface;

Said valve seat is provided with road binders passage; One is communicated with the valve rod attachment hole of road binders passage down; Be provided with in the said valve body one be used to control down road binders passage break-make valve rod, the upper end and the piston of this valve rod are affixed, its lower end is passed the valve rod attachment hole with movable connection method and is stretched into down the road binders passage;

It is characterized in that: said spring has one, and this spring is a linear springs, coaxial being set on the valve rod, and its upper end props up piston, and its lower end props up valve seat;

Seal through a dust-proof seal ring, a YX RunddichtringO between said valve rod and the valve rod attachment hole hole wall.

Further, a dismountable pipe joint is equipped with in the control port of setting out on a journey on the said valve gap, and is furnished with one and can passes the jackscrew of the control port of setting out on a journey, and said jackscrew is column, and is independent of valve body and valve gap.

The piston type crisis intercepter valve (IV) that the utility model provides; Junction plane at valve rod and valve seat has increased dust-proof seal ring and YX RunddichtringO; Can effectively avoid dust to sneak into the junction plane of valve rod and valve seat, thereby effectively avoid valve rod to produce bite, also can guarantee its operating accuracy after the operating time is long; Therefore a spring control piston only need be set in the valve body replys; Can make response fast, have characteristics easy to maintenance, low cost of manufacture, under the ultralow operating conditions of the control oil channel working pressure of setting out on a journey; Also can guarantee its crisis blocking effect, not set up in the control oil channel of setting out on a journey and to utilize jackscrew simulation control oil channel to set up working pressure under the state of working pressure to debug road system oil-way down.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment's piston type crisis intercepter valve (IV);

Fig. 2 is the enlarged view of the A part among Fig. 1.

Embodiment

Embodiment to the utility model describes in further detail below in conjunction with description of drawings, but present embodiment is not limited to the utility model, and analog structure of every employing the utility model and similar variation thereof all should be listed the protection domain of the utility model in.

Like Fig. 1-shown in Figure 2, a kind of piston type crisis intercepter valve (IV) that the utility model embodiment is provided comprises valve body 6; And be sealed on the valve gap 4 of valve body 6 upper ends; Be sealed on the valve seat 12 of valve body 6 lower ends, be installed in valve body 6 inner chambers along valve body piston 5 in axial sliding, the periphery of said piston 5 is connected with the inner wall sealing of valve body 6; And through spring 7 connection valve seats 12, said valve gap 4 is provided with the control port of setting out on a journey that is communicated with piston 5 end faces;

Said valve seat 12 is provided with road binders passage 13; One is communicated with the valve rod attachment hole of road binders passage 13 down; Be provided with in the said valve body 6 one be used to control down road binders passage 13 break-makes valve rod 8; The upper end of this valve rod 8 and piston 5 are affixed, and its lower end is passed the valve rod attachment hole with movable connection method and stretched into down road binders passage 13;

It is characterized in that: said piston 5 is all-aluminium pistons, and said spring 7 has one, and this spring 7 is a linear springs, coaxial being set on the valve rod 8, and its upper end props up piston 5, and its lower end props up valve seat 12;

Between said valve rod 8 and the valve rod attachment hole hole wall through a dust-proof seal ring 9, a YX RunddichtringO 10 sealings.

Among the utility model embodiment, a dismountable pipe joint 1 is equipped with in the control port of setting out on a journey on the said valve gap 4, and is furnished with one and can passes the jackscrew 3 of the control port of setting out on a journey, and said jackscrew 3 is column, and is independent of valve body and valve gap.

When the utility model embodiment uses; One termination of following road binders passage 13 is gone into to control the following road high-pressure system oil circuit of the oil engine of steam turbine valve action; The other end is received a nothing and is pushed back hydraulic fluid port, and the low voltage control oil circuit of setting out on a journey is received in the control port of setting out on a journey on the valve gap 4;

The utility model embodiment's working principle is following:

During proper functioning; After the normal foundation of the working pressure (0.15MPa) of the low voltage control of setting out on a journey oil circuit; The control port of setting out on a journey through on the valve gap acts on piston-top surface, makes piston overcome the elastic force of spring, drives valve rod and slides down to the oil circuit blocking-up of road binders passage down; Thereby set up the system oil pressure of road high-pressure system oil circuit down, the oil engine in the high-pressure system oil circuit of following road just can be controlled the steam turbine valve proper functioning;

When the low voltage control oil circuit of setting out on a journey breaks down, when being directed at its oil pressure and disappearing, piston is under the elastic force effect of spring; Drive valve rod and upwards slide, make down the oil circuit conducting of road binders passage, this at present the hydraulic oil of road high-pressure system oil circuit let out nothing and push back hydraulic fluid port; Make down the system oil pressure of road system oil-way drop to zero rapidly; Make oil engine drive steam turbine valve and close rapidly, make the steam turbine emergency shutdown, thereby reach the effect of protection steam turbine;

When the control oil channel of setting out on a journey is not set up under the state of working pressure under the debugging road system oil-way; The pipe joint of control port of will setting out on a journey earlier unloads; Again jackscrew is passed set out on a journey control port and downward ejector ram, make piston overcome the elastic force of spring, drive valve rod and slide down to the oil circuit blocking-up of road binders passage down; Thereby set up the system oil pressure of road high-pressure system oil circuit down, can realize that the simulation control oil channel oil pressure of setting out on a journey sets up and debug down the road system oil-way.

Claims

1. piston type crisis intercepter valve (IV); Comprise valve body, and be sealed on the valve gap of valve body upper end, be sealed on the valve seat of valve body lower end; Be installed in the body cavity along valve body piston in axial sliding; The periphery of said piston is connected with the inner wall sealing of valve body, and connects valve seat through spring, and said valve gap is provided with the control port of setting out on a journey that is communicated with piston-top surface;

2. piston type crisis intercepter valve (IV) according to claim 1; It is characterized in that: a dismountable pipe joint is equipped with in the control port of setting out on a journey on the said valve gap; And be furnished with one and can pass the jackscrew of the control port of setting out on a journey, said jackscrew is column, and is independent of valve body and valve gap.