Classification of safety valves

Classification of safety valves
Classification
Types of
Description
According to the principle of action
Direct load
Direct mechanical load to overcome media forces under the valve flap
Indirect load
Pilot
Use a pilot valve to drive or control the main valve
With supplementary load
Always maintain an additional force to enhance the seal before reaching the set pressure, which is provided by the external energy source and released when the set pressure is reached
According to the action characteristics
Proportional action
The opening height changes gradually as the pressure increases
Two-stage action
(bounce action)
The opening stage of the opened zui gradually increases with the increase of pressure, and then rapidly opens to the specified height.
Press to open height
Micro-open
Opening height is 1/40 to 1/20 of the diameter of the runner
Fully open
The opening height is equal to or greater than 1/4 of the diameter of the runner
Zhongqi
Opening height between micro-open and full-open
Press with or without back pressure balance mechanism
Back pressure balance
Using a component such as a bellows, piston or diaphragm to balance the force of the back pressure on the valve flap before the safety valve is opened
Conventional
Back pressure balancing element
Press valve loading
Heavy hammer
Load directly with a weight
Lever weight
Use the weight to load through the lever
Spring type
Loaded with springs
Air chamber
Load with compressed air

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