Are there any standards or specifications that require valves to have markings indicating their open and closed states?

2016-12-06View Original

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Are there any standards or specifications that require valves to have markings indicating their open and closed states?

Reply #22016-12-06

For normally open and normally closed, right? Some valves are locked. I don’t know the standards.

Reply #32016-12-06

The switches come in different forms and have different markings; I’ve never seen any standards for them.

Reply #42016-12-06

There are no standards; for some valves, it’s necessary to know their condition

Reply #52016-12-06

Identifier? Do you mean the arrow on the rotary switch?

Reply #62021-09-15

GB12220-2015 Industrial Valves – Marking

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