PPR valves

PPR valve

When the input signal from the controller increases, the plate spring og the bellows atcs as a pivot. The clearance between the nozzle and the falpper will increase when the falpper receives the rotary torque in the counter-clockwise direction and the back pressure of the nozzle will decrease. As a result, the exhuast vale of the pilot valve moves to the right and the output pressure of the OUT1 increases(as OUT2 decreases) to move the cylinder actuator. The movement of the actuator in turn rotates the feeback shaft, and the feedback spring lengthens or shortens by the movement of the feedback cam connected to the feeedback shaft. The actuator stays in the position where the spring force is balanced with the force generated by the input signal in the bellows. The compensation spring is for direct feedback of the motion of the exhasut valve and is connected to the flapper to enhance the stability of the loop.

There are some technical specifications about it:(1)input signal is 3 to 15 psi; (2)air supply pressure is max.100psia; (3)standard stroke is 60 to 100; (4)air piping connection is 1/4" NPT; (5)ambient temperature is -4 to 158 DegF; (6)pressure gauge is stainless steel; (7)output characteristics is linear; (8)linearity is within+/-1.5% F.S; (9)sensitivity is within 0.5% F.S; (10)hysteresis is within 1.0% F.S; (11)repeatability is within +/- 0.5% F.S; (12)air consumption is 0.18CFM(sup.20 PSI); (13)flow capacity is 2.83CFM(sup.20PSI); (14)material is aluminum die casting body; (15)weight is 4.6 kbs.