Fluid control one-way pneumatic valve structure and working principle

when control oil mouth impassability pressure oil, the oil can only from PA and PB; When the control oil pressure oil, oil can be free by positive and reverse. One-way pneumatic valve cover: right-angled one-way pneumatic valve, pneumatic valve, one-way control one-way pneumatic valve, low pressure one-way pneumatic valve, etc. When the oil flow, aerodynamic force balance of valve core expression is:
pKAK - pAAK - FKM = pBA - pAA=Fs Fs W(
type of pK - — — The oil pressure control, the unit is N.
pA— — — Reverse the oil pressure of the oil cavity, the unit is N.
pB— — — Reverse feed oil cavity pressure, the unit is N.
FKM— — — Control piston friction resistance, the unit is N.
FM— — — Total friction cone pneumatic valve core, the unit is N.
Fs— — — The spring force, the unit is N.
W— — — Pneumatic valve core weight, unit of N;
AK - — — Control piston area, the unit is m;
A— — — Pneumatic valve seat area, the unit is m.
when out control piston and taper pneumatic valve core of frictional resistance, the oil pressure control for:
pK = [ ( pB- pAA Fs W] /AK pA(
this value is to ensure that the oil flow control oil pressure. If the pneumatic valve mouth shut, the oil flow stops, the pressure of the oil cavity pA =. According to the control piston cavity drainage way divided into the drainage and leaking. Internal drainage is the short form hydraulic control one-way pneumatic valve. Leaked type hydraulic control one-way pneumatic valve, the leakage type hydraulic control one-way pneumatic valve reverse pressure of the oil cavity pA only role in the control piston top, function area is much smaller, at the same time, the reverse pressure oil and control of the oil cavity pressure oil leak to the piston top and bottom section between the cavity, can directly lead to the outside of the pneumatic valve body through the leak port, in order to avoid because of the influence of leakage oil accumulation control upward movement of the piston, is called leaked type hydraulic control one-way pneumatic valve. Double entry structure hydraulic control one-way pneumatic valve, one-way pneumatic valve with unloading small pneumatic valve core in the core. Control in the piston during open top small pneumatic valve core is that the main oil pressure relief, open another one-way pneumatic valve, pneumatic valve core control pressure only for work. %, no unloading small pneumatic valve core of the control of the hydraulic control one-way pneumatic valve pressure % ~ % of work pressure.