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Question:

What's the difference between the cut-off, check, check, and stop valves three? Better picture,

What's the difference between the cut-off, check, check, and stop valves three? Better picture,

Answer:

Stop check valve: when the handwheel is rotated so that the valve stem rises, the disc does not rise together, but only the valve clack is released.
Stop check valve: when the handwheel is rotated so that the valve stem rises, the disc does not rise together, but only the valve clack is released.
Stop check valve: when the handwheel is rotated so that the valve stem rises, the disc does not rise together, but only the valve clack is released.

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