knowledge of safety valve repai
safety valve repai in various types of valve repair is a more common varieties of valve repair, safety valve repai work, the need for more knowledge about safety valve repai
safety valve is installed in the equipment, containers or pipelines, protection from overpressure, when the pressure within the container or pipe exceeds the allowable value, the valve automatically opens discharge medium; when the pressure is reduced to the specified value, the valve automatically closes.
safety valve can be divided into direct drive mode according to acting and pilot. Direct pressure on the grounds of the valve inlet direct drive system, this time, it is provided by a spring or a heavy hammer to overcome the effect of mechanical load in the bottom of the medium pressure valve. Pilot is it driven by a structure to guide the use of agencies or imposing a closing force the release of the safety valve on or off.
safety valve according to the different structure can be divided into:
Spring-loaded safety valve
With a compression spring force to the pressure balance valve flap, so that safety valve seal. The advantage is safety valve, high sensitivity, light, limited to the installation location, this safety valve is more commonly used. Drawback is that the compression spring with the spring deformation force changes, the temperature is high, there is heat and heat the spring.
Lever-type safety valve hammer
Hammer force amplified by the lever on the valve load. Advantage is that the process of opening and closing the valve on the valve on the load force change. The disadvantage is more sensitive to vibration, poor performance back seat. Commonly used in stationary equipment.
Pulse safety valve
The main valve and auxiliary valve design together, through the auxiliary valve pulse valve to drive the main role. Commonly used in large-diameter, large displacement and high pressure systems.
Full Kai-safety valve
Opening height greater momentum with the gas medium, so that the valve open enough height, discharge excess media.
Low lift type safety valve
Opening height not apply to liquid medium and the displacement is not the occasion.
Fully enclosed safety valve
safety valve on discharge medium sealed, drained through the discharge pipe, commonly used in the flammable, explosive, toxic or special media applications.
Semi-closed safety valve
safety valve on emissions, part of the media excluded from the discharge pipe, part of the media from the valve seat, the gap in the stem into the atmosphere.
Open-type safety valve
Open, medium excretion into the atmosphere, suitable for pollution-free medium.
Pilot-operated safety valve
By the main valve and a pilot valve, pilot valve function after the system pressure to bear so that the main valve open or closed.
In addition, from the safety valve on the external structure, can be divided into a spanner wrench and no, there is no bellows and bellows, with no heat sink and heat sink and so on. A bellows safety valve for corrosive media or back pressure fluctuations occasions; a wrench safety valve in case of emergency, relief from the manual operation; a heat sink of the safety valve for the temperature is higher than 300 ℃ occasions |
