Krožni ventil（Shut-Off Valve）, also called gate valve. In the process of opening and closing, the friction force between the sealing surfaces is small, it is more durable, the opening height is not large, the manufacture is easy, and the maintenance is convenient. It is not only suitable for medium and low pressure, but also suitable for high pressure.
Krožni ventili imajo naslednje prednosti:
1. Simple structure, convenient to manufacture and maintain.
2. Delovni hod je majhen, čas odpiranja in zapiranja pa kratek.
3. Dobro tesnjenje, majhno trenje med tesnilnimi površinami in dolga življenjska doba.
Krožni ventili imajo naslednje pomanjkljivosti:
1. Upor tekočine je velik in sila, potrebna za odpiranje in zapiranje, je velika.
2. Not suitable for medium with particles, high viscosity and easy coking.
3. Slaba prilagoditev.
