CN2083229U

CN2083229U - Negative pressure safety valve

Info

Publication number: CN2083229U
Application number: CN 90223398
Authority: CN
Inventors: 王汉洲
Original assignee: YONGJIA COUNTY VALVE PLANT
Current assignee: YONGJIA COUNTY VALVE PLANT
Priority date: 1990-11-06
Filing date: 1990-11-06
Publication date: 1991-08-21

Abstract

The utility model relates to a negative pressure safety valve, comprising a valve body, a valve seat, a valve clack, a recoil disc, an adjusting ring, a locking screw, a valve rod, a guiding element, a spring and a spring fill. When the degree of vacuum of the inner chamber of the valve body exceeds the allowable value, the pressure difference between the outer chamber and the inner chamber overcomes the acting force of the spring to make the valve clack move down and open automatically, to deliver the medium in the outer chamber into the inner chamber, to make the container or the pipeline system which is running in or possibly lies in the vacuum status avoid being damaged by the barometric pressure. The utility model has simple structure and reliable work, and realizes the negative pressure protection of the container or the pipeline system efficiently. The utility model can also make the safety coefficient of the design of the wall thickness reduced, to achieve the purpose of material saving and cost reduction.

Description

Negative pressure safety valve

The utility model is about a kind of safety valve, can automatic protective system when particularly running on the hypotony of the system of vacuum state or container or the negative pressure relief valve of vessel safety.

Existing safety valve is generally the malleation safety valve, soon it is installed in and plays the overpressure protection effect on pressurized equipment, container and the pipeline, before system's internal pressure surpasses permitted value, safety valve is airtight, when internal pressure raise and surpass permitted value, valve was opened immediately automatically, then the medium in the full dose releasing system, pressure is descended, to prevent that pressure from continuing to raise; When pressure was reduced to specified value, valve was in time closed, and guaranteed sealing, thus the safe operation of protective system.But such safety valve having needed can not be used for the system of negative pressure protection.In fact, run on equipment, container or pipe-line system under the vacuum condition, as negative-pressure conveying system, its Wall thickness Determination degree of vacuum as a design parameter, if when degree of vacuum surpasses the limiting value that allows, just system holds pressure that can't stand atmosphere and wrecks.This class accident happens occasionally; caused the concern of relevant department; though and existing inhalation valve can play the negative pressure protective action to containers such as petroleum storage tank, fermenting tubs; but to running on the system under the vacuum condition; because of its discharge capacity too small (genus micro-open type), be difficult to adapt to, moreover; its malleation overpressure protection function can not be utilized, and redundancy function and unnecessary structure occur.

It is big that the purpose of this utility model provides a kind of discharge capacity, and cracking pressure and Reseating pressure of a safety valve difference are adjustable, simple in structure, aesthetic in appearance, and the negative pressure relief valve of energy rain-proof dust-proof.

Fig. 1 is the utility model embodiment 1 sectional view;

Fig. 2 is the linkage structure partial sectional view of the utility model valve body and valve seat.

The utility model comprises that valve body (1), valve seat (4), flap (2), valve rod (7), guiding element (8), spring (9), spring fill out (11), adjusting nut (12), seal ring (13) and outer cover (10).Valve seat (4) is equipped with seal ring (13) back with valve body (1) and fixedlys connected between the two, fixedly connected with flap (2) in valve rod (7) lower end, the middle part cooperates with guiding element (8) endoporus, the empty sleeve spring in upper end is filled out (11) back and is threaded with adjusting nut (12), spring (9) places spring to fill out between (11) and the guiding element (8), guiding element (8) can be fixed in valve seat (4) endoporus, also can be made as one with valve seat (4), has connecting tendon (D).The utility model also includes Disc holder (3), Adjusting ring (5), lock screw (6), Disc holder (3) is fixedlyed connected with valve rod (7) below flap (2), card up, Adjusting ring (5) is threaded with valve seat (4) lower, outer perimeter, rotate Adjusting ring (5) it is moved up and down, lock screw (6) is pinned the rotation of Adjusting ring (5).Stretch position (shown in Figure 1) under lock screw (6) and valve body (1) upper end wall (shown in Figure 2) or the valve seat (4) and be threaded, can lock in Adjusting ring (5) tooth by its top.

Outer cover (10) covers valve body (1) top, outer cover (10) periphery has many holes (can be screen structure), so that air inlet, again bell mouth shape is made on valve seat (4) top, so that water conservancy diversion, and its height more than the periphery hole, makes rainwater and grit be difficult to enter in the exocoel (B) at outer cover (10).

Valve described in the utility model lower end is inserted in equipment, container or the pipe-line system that runs under the vacuum condition, pushed down valve seat (4) sealing surface (C) because the active force of spring (9) makes to move on the flap (2), valve is in sealing state.When the degree of vacuum of valve body (1) inner chamber (A) surpasses specified value, the active force that the pressure difference of exocoel (B) and inner chamber (A) overcomes spring (9) moves down flap (2), valve opening, because the effect of Disc holder (3) is all opened flap (2), gas full dose in inner chamber (A) is arranged in the exocoel (B).Pressure in the inner chamber (A) is raise, behind the rising certain value, flap (2) return, valve is in closed condition again.Unload lock screw (6), available screw-driver paddling Adjusting ring (5) moves up and down it, to adjust flap (2) return pressure to the scope of regulation.Turn adjusting nut (12), can adjust cracking pressure.

The utility model is simple in structure, reliable operation, and discharge capacity is big, and Blowdown of a safety valve is adjustable, easily reach the requirement of regulation, valve seat (4) upper end is shaped as bell mouth shape, and its height is more than position, outer cover hole, can play rainproof, dustproof effect,, make aesthetic in appearance with outer cover cover position.The utility model has realized running on the negative pressure protection of equipment, container or pipe-line system under the vacuum condition effectively, and the wall thickness design safety coefficient of container and pipe-line system is reduced, and reaches material-saving, reduces the purpose of system cost.

Claims

1, a kind of negative pressure relief valve, comprise valve body (1), valve seat (4), flap (2), valve rod (7), guiding element (8), spring (9), spring is filled out (11), adjusting nut (12), seal ring (13) and outer cover (10), valve seat (4) is equipped with seal ring (13) back with valve body (1) and fixedlys connected between the two, fixedly connected with flap (2) in valve rod (7) lower end, the middle part cooperates with guiding element (8) endoporus, the empty sleeve spring in upper end is filled out (11) back and is threaded with adjusting nut (12), spring (9) places spring to fill out between (11) and the guiding element (8), guiding element (8) or be fixed in valve seat (4) endoporus or and be made as one with valve seat (4), it is characterized in that also comprising Disc holder (3), Adjusting ring (5), lock screw (6), Disc holder (3) is fixedlyed connected with valve rod (7) below flap (2), Adjusting ring (5) is threaded with valve seat (4) lower, outer perimeter, stretch the position and be threaded under lock lock screw (6) and valve body (1) upper end wall or the valve seat (4), its top is locked in Adjusting ring (5) tooth.

2, valve according to claim 1 is characterized in that described valve seat (4) top is horn-like, and its height is at outer cover (10) more than the periphery hole.