Emerson VSM, VSR, VSS service manual Stop Check Valve Operation

Stop Check Valve Operation

AUTO

In the “Auto Position”, the stop valve is operating as a check valve, allowing flow in the directions of the arrows.

To set the valve to the automatic posi- tion, fully close the valve, and turn the stem out as indicated by the chart below.

CLOSED

In the manually “Closed Postion”, the stop check is operating as a conventional stop valve, not allowing flow in either direction.

OPEN

In the manually ” Open Position”, with the valve stem fully back seated, the valve disc is lifted slightly, allowing flow in either direction.

Valve Size	1.5”	2”	2.5”	3”	4”	5”	6”	8”
Number of Turns Open	2	2.25	2.75	3.25	4.5	3.75	5.75	7.75
(from closed position)

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