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ขั้นตอนการใช้เว็บไซต์ คู่มือการใช้เว็บไซต์ The seat will be the orifice that presses against the disc when closing the valve. The seat and disc are often created from exactly the same materials. Once the seat or disc is damaged, the valve will turn out to be passing and struggling to prevent the flow. https://edwinidkrb.blazingblog.com/15690305/the-basic-principles-of-pneumatic-actuator-ball-valve


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