(c) Lock the setscrew and locknut of the swivel assembly and drive the valve to low fire. Recheck the pressure readings; similarly recheck the high fire reading.
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(d) Repeat above steps until the setup is satisfatory.
LINKAGE ADJUSTMENTS for 1008A and 1010A VALVES
Use two wrenches to tighten a pipe into the valve.
Adjustable Port Valves are precision built and should not be sub- jected to unnecessary strains or rough handling. Provide proper pipe alignment by use of pipe hangers and supports. Instead of holding the valve body itself between jaws of a vise, screw valve onto a piece of pipe held in a vise. When installing valve in a pipe line, use a pipe wrench at the lugs provided. Valve port should be adjusted so some pressure drop is ob- served across valve at high fire. To adjust valve port opening for required flow conditions, set linkage at full valve travel. Remove adjusting screw cover. For sizes ¾" to 6" turn adjusting screw knob clockwise to increase or counterclockwise to de- crease flow. For size 3⁄8" and ½" turn knob clockwise to decrease flow or counterclockwise to increase flow. This raises or lowers the curtain in the core, altering valve port opening.
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The packing nut should be tight to prevent valve from leaking around adjusting screw and it secures the adjusting screw in position, therefore it is difficult to operate the port adjustment by hand, necessitating use of a wrench. Always assure packing nut is tightened to prevent leakage and always replace adjusting screw cover to prevent tampering after making any curtain adjustments. 1008A valves are factory lubricated with general purpose lithium #2 grease. For lubrication instructions see Sheet 1008A-3 (see Sheet 1010A-1 for oxygen use).
CONTROL HANDLE
The table (below) shows the number of turns required for adjusting the curtain height from full open to fully closed.
CORE
Number of turns from full open to fully closed
Valve Size
PORT OPENING
CURTAIN
3⁄8 " and ½"
11
CURTAIN ADJUSTING KNOB
¾ "
14 16
1"
1¼" and 1½"
23 30 35 43 60 87
2"
2 ½ "
3" 4" 6v
Instructions 1020 Page 2
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