bellows-operated pilot valve的意思|示意

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膜盒控制阀，膜盒导引阀

膜盒控制导阀 ... bellows valve波纹管阀 bellows-operated pilot valve膜盒控制导阀，膜盒导引阀 bevel seat valve斜座阀，角阀 ...

膜盒导引阀 ... bellows valve波纹管阀 bellows-operated pilot valve膜盒控制导阀,膜盒导引阀 bevel seat valve斜座阀,角阀 ...