280 series Italian Besa pilot operated safety valve

280 series Italian Besa pilot operated safety valve

BESA's main product lines:

139 threaded connection safety valve

240F threaded connection safety valve

249 threaded connection safety valve

130 flange connected safety valve

240 flange connected safety valve

250 flange connected safety valve

260 flange connected safety valve

280 flange connected safety valve

290 flange connected safety valve

280 series Italian Besa pilot operated safety valve

Pilot operated safety valve A pilot operated safety valve is composed of a main valve（ safety valve） And a pilot valve（ straightJoint action type safety valve）compose ，The main valve is a true safety valve ，The pilot valve is used to sense the pressure of the pressurized system and activate the main valveOpen and close.

To ensure the sealing performance and other performance indicators of the pilot operated safety valve ，Not only does it affect the sealing surface of the main valve seat and valve disc There are strict requirements for the flatness and surface roughness of the sealing surface .And the sealing surface of the valve seat and the sealing surface of the valve disc of the pilot valve are flat There are also strict requirements for smoothness and surface roughness ，Simultaneously compressing the projectileGeometric dimensions of springs 、material 、There are also strict heat treatments requirement .This is the only way to meet the requirements of sealing pressure ratio.

To maintain the closing force of the main valve ，And operate the main valve and pilot valve ，Energy may come from the system medium 、An external energy source ，Or from both of these sources .When the system pressure begins to exceed a set limit value ，Pilot valve or by removing or reducing Reduce the closing force and force the system medium to open the main valve； Or generate a force to open the main valve .After the system pressure decreases， Pilot valve generates closing force again ，Or eliminate the opening force .According to this opening and closing mode ，Can be in the safety valve Maintain a strong closing force before opening .Therefore ，Pilot operated safety valves even operate at pressures close to the set pressure Can also maintain high sealing performance.

The magnitude of the closing force of a pilot operated safety valve may not be limited before it is about to open ，But for the precursor of certain structuresThe safety valve may also be restricted by selection .The so-called closing force is limited ，refers toOnce the pilot valve fails， The system pressure can cause the main valve to open within the allowable pressure range .For pilot operated safety valves with limited closing force ，His safety The installation requirements are usually not like pilot operated safety valves with infinite closing forcestrict.

Acquisition of operating medium ，Starting from an easily accessible perspective ，There is nothing more reliable than the system medium itself .but ，first The pilot valve is designed to adapt to operating conditionsThis medium.