Through engine control valve structure and use characteristics

Through engine to adjust the structure of the valve body parts: two seat, spool, spool valve body double oriented. The valve was produced in the 1940s, sixties joint design, is a product of the sixties levels. It uses the following features:
(1) due to the fluid pressure acting on the two spool, unbalanced forces offset each lot, and therefore allows a large pressure difference. Such mutual offset structure of the many unbalanced force is balanced structure.
(2) due to the existence of the two sealing surfaces of the machining error, the valve body and the valve seat when closed, can not simultaneously seal, therefore, the single-seat valve leakage than ten times larger to a hundred times; same time, the temperature change when the amount of leakage. will increase, which is the disadvantage of its projection, so can not be used in the process required leakage small occasions.
(3) due to the more complex flow path of the valve body, combined with the vertical guide at the solid particle easily jammed, not for a high viscosity, suspension, containing solid particles, such as easy to precipitate and easy to plug occasions!
(4) is too bulky