Steam Stop Valve – Parts and Working

Steam Stop Valves are mounting in boilers which are important for safe operation of boiler. It is present in the top of boiler.
It is used to transfer the steam of the boiler to the place where it is required.

It is generally used to ragulate the flow of steam from boiler to steam pipe or steam pipe to another steam pipe.

Parts of Steam Stop Valve:

1 Steam Passage :
Steam from the boiler enters here.

2 Valve:
It is genrally made of brass so that it is protected from wear and tear. This valve stops the steam from leaving the boiler.

3) Valve Seat :
It is also made of brass so that a close fitting is obtained between brass and brass sheet and these two last longer.

4) Hand Wheel:
It is present at the top of the steam stop valve. When it is rotated.

5) Valve Body:
It is generally made of cast iron or cast steel.

6) Spindle:
It is the long rod that connects handwheel to valve>

7) Yoke:
It is act as a support to the handwheel rod. it is present on both side of Handwheel rod.

8) Stud:
It is the rod of the Yoke which gives yoke a height.

9) Gland:
It is present between the stud and rod of the handwheel. It prevents the leakage of steam from the space between the handwheel rod and valve body.

Working of Steam Stop Valve:

1 By default the valve of the steam stop valve is closed and steam is not allowed to pass through the valve.
2 When the spindle is rotated by rotating the hand wheel, the valve move up and down according to the direction of the rotation.
3 When the valve moves up the steam in the boiler is allowed to pass through the steam stop valve and is transferred to area where it is required.