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Products Show
 Location£ºHome - Products Show - Valves - Spring safety valve
Flow Control Valve -Pressure Safety Control Valve

Spring type safety relief valves directory-pressure safety valve-pressure safety control valve

Structure and function of spring type safety relief valve
Working principle of spring type safety valve
Low temperature spring type safety valve
Backflow valves (Back flow preventer
Vacuum negative pressure valve
Model selection of safety relief valves
Tianjin U-ideal Instrument Co., Ltd
Tianjin, China
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Spring type safety valves' working principle:
Spring type safety relief valve works through adjusting spring force to prevent medium pressure and realize sealing purpose. Under the condition of spring force greater than medium's normal pressure, valve disc is at the close state, when medium pressure exceeds the set pressure, the spring is compressed, and lead the disc sealing faces separated, the valve open automatically, and relief pressure; When medium pressure reduced to normal pressure, the valve disc go back to valve seat under the spring force, disc sealing faces and valve seat sealed again, the valves close automatically.

Sealing face's accuracy and cleanness of Valve disc and valve seat direct related to valve's tightness.
In the range of spring pressure, the valve set pressure can be changed by rotating the adjust screw.
Change the seal pressure relief angle and lifting force by rotating the adjust ring to achieve suitable reseating pressure, relief pressure and disc's open height. Low temperature safety valve
Low temperature valves are widely used in medium Natural gas, liquefied gas, liquid oxygen, liquid ammonia, liquid hydrogen and liquid nitrogen in -29º C~-196 º C
Valve material selection: LCB, 304, 316, Monel etc.; Spring type is decided by medium. All valve parts are at -196 º C subzero treatment for 24hours.

Low temperature safety valves are installed on low temperature, ultra-low temperature equipment and storage tank, tanker; The valve is low temperature resistant, good sealing, reliable and open sensitive, assured the cryogenic equipment safety work. If the medium is toxic or inflammable, choose the bellows valves.

Safety reflux valve (return valve; Reverse flow valve)

Reflux valves install at the liquid reflux pipe of LPG tank pump outlet. When the front pump pressure greater than rated value, safety reflux valve reduce pressure & back flow.

Safety reflux valve include flange parallel type (picture 4) and right-angle type (picture 2). Disc sealing material is PTFE (picture 5), good sealability. Valve open and close function is realized by the inlet and outlet different pressure.

Working principle
When inlet pressure is greater than outlet pressure of 0.5MPa, spring is compressed, and valve open automatically. When inlet pressure is less than outlet pressure of 0.5MPa, the valve get closed automatically by spring moving.

Vacuum negative pressure safety valve

Main application
Vacuum negative pressure safety valve is mainly used in negative pressure system.

Safety valve model selection
Working pressure and medium temperature decide valve's temperature range and nominal pressure; Valves set pressure which define the spring pressure class, medium type and working temperature decide the valve material and structure; Safety valves relieving capacity decide the valve's orifice area

Item Parts name Function
1 Valve body Main pressure-containing parts
2 Seat Quality pressure-bearing part, main sealing part
3 adjust Ring Adjust reseating pressure, relieving pressure and opening height.
4 Backlash plate When medium discharge, it act reaction force, improve disc lift force
5 Spring The main parts of safety valve pressure adjusting
6 adjust screw Adjust set pressure
7 locking nut To prevent the screw loose
8 Rod Transfer the spring force to disc or backlash plate
9 lever Manuel relief
10 bonnet Connecting parts, spring cavity, enclosed safety valve pressure-bearing part
11 spring set Spring supporter
12 radiator high temperature valve, lower spring cavity temp.
13 guide sleeve Guide and locate valve disc
14 disc Opening, sealing main parts
15 set screw Prevent adjusting ring loose.

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Copyright level sensors and flow meters Tianjin U-ideal Instrument Co., Ltd ( Hebei Xukang Meter Manufacturing Co.,Ltd) all right reserved.

Tianjin U-ideal Instrument co., ltd is one of esteem company with collection of scientific research, development and sales. We have abundant technical capacity, special scientific research teams with advanced producing and checkout equipment.

Tianjin U-ideal Instrument Co., Ltd produce and sell Magnetic Level Indicator, bi-color quartz glass tubular level gauge, liquid level switch, float switch, level sensor, level transmitter, level switch, tank gauge, water gauge, liquid level instrument, ultrasonic level sensor, flow meter, PD flow meter, oval gear flow meter, dual-rotor turbine flowmeter, duplex rotor meter, vortex flow meter, turbine flowmeter, electromagnetic flowmeter, metal rotary flow meter and valves,oil/water industrial control systems.

We are TIANJIN U-IDEALINDUSTRIES COMPANY , have accumulated abundant experience especially in high temperature and high pressure liquid level meters ,and antiseptic liquid level gauge .we also made to orders of non-standard liquid level meters to satisfy different customers .those products has been used by many enterprises of all walks of chemical,industries, petroleum ,electricity, food, light, medicine, metallurgy, papermaking etc.. and our products have been certified by quality system ISO9001£º2000.

Tianjin U-ideal Instrument Co. are also engaged in flowmeter trade. Such as gas flowmeter and liquid flowmeter with the type of explosion-proof and others.