เหตุผลที่วาล์วต้องอาศัยหัวขับวาล์วในการควบคุมมีดังนี้ The seat would be the orifice that presses in opposition to the disc when closing the valve. The seat and disc are frequently made from a similar product. When the seat or disc is weakened, the valve will turn into passing and not able to quit the movement. Please https://control-valve93703.blogitright.com/15651588/a-review-of-pressure-gauge