气垫阀（或称Cushion Valve缓冲阀）是一种新颖的环状阀。它与普通环状阀结构基本相同,其特点在于,气垫阀的升程限制器上设有环状凹槽,形成影响阀片运动的气体缓冲室.阀片从全闭到全开整个过程始终被限制在缓冲槽内,或者起码开启后马上进入槽内（这种气垫阀升程稍大于或等于阀片厚度）。随着阀片迅速开启,缓冲室内的气体从小孔和环形 Air cushion valve (or Cushion Valve cushion valve) is a novel ring valve. It is basically the same with the general structure of the annular valve, which is characterized by the cushion valve lift limiter has an annular groove, forming a gas buffer chamber affecting the movement of the valve. Valve from the fully closed to fully open the entire process Is confined to the buffer tank, or at least open into the tank immediately after opening (this air lift valve is slightly larger than or equal to the valve plate thickness). As the valve opens rapidly, the gas in the buffer chamber passes through the orifice and the ring