เหตุผลที่วาล์วต้องอาศัยหัวขับวาล์วในการควบคุมมีดังนี้ Pneumatic pressure enters this housing applying pressure on the diaphragm. Since the air pressure boosts to your diaphragm the force exerted against the spring raises leading to the actuator stem to move. In this method, the actuator is mounted in a stationary placement which has a shaft mounting bracket https://elliottf1249.shotblogs.com/pressure-gauge-4-an-overview-28867013