通常分为常开型，常闭型和自保持式三种。
Usually divided into normally open, normally closed and self-holding three.
阀门有常开和常闭两种，可用于燃油，液压或气动应用领域。
Valve types include Normally Open and Normally Closed valves, for use in fuel, hydraulic, or pneumatic applications.
可选包括直接作用和隔膜式常开或常闭版本。
Options include direct acting and diaphragm type operations in a Normally Open or Normally Closed version.
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