RED VALVE INSTRUCTION MANUAL
MODEL GS700 REVERSE-ACTING ACTUATOR
3.3.2 Assembly
A. If the diaphragm is being replaced, apply gasket compound (CV P/N 197077 or equivalent) to the surface of the diaphragm (item
14) where the diaphragm stop (item 12) seats. Assemble the diaphragm, diaphragm plate (Item 13) and diaphragm stop to the
actuator stem (Item 16) using the flat head screw (Item 11). Torque the flat head screw to the value shown on the assembly drawing.
B. Install the O-ring (item 36) with o-ring grease in the outside groove of the bushing (item 30). Install the bushing in the yoke plate
(Item 31). Note that the bushing should be oriented so that the larger internal groove is at the upper end of the yoke plate. Install the
upper and lower retaining rings (Rem 34) on the bushing. Install the U-cup seal (Item 33) with o -ring grease in the upper groove of
the bushing. Install the o -ring (Item 35) with o -ring grease in the lower groove of the bushing.
C. Place the spring plate (Rem 17) and spring (Item 15) into the yoke. Block the spring plate and the spring up as necessary to
permit assembly of the stem.
D. Install the yoke plate assembly in the yoke (Item 1). As an option, apply gasket compound (CV P/N 197077 or equivalent) to the
gasket (item 32). Place the gasket over the yoke plate. Orient and install the cover (Item 2) on the yoke. Install lockwashers (Item 10)
and hex nuts (item 9) on the cover studs. Torque the nuts to the value given on the assembly drawing.
E. Carefully lower the stem assembly through the bushing and the spring plate. Install the thrust washer (Item 18) and spring
adjuster nut (Item 29) on the stem. Rotate the spring adjuster nut until the spring is just starting to be compressed.
F. Place the base (item 3) on the cover and install the hex head cap screws (item 4), hex nuts (Item 5), and eyebolts (item 6 on the
actuator assembly drawing). Torque the fasteners to the value on the assembly drawing. Thread the vent (Item 40 on the assembly
drawing) into the base.
G. Place the upper stem weldment (item 22) on the stem so that the bottom surface of the upper stem weldment is approximately
0.06" (1.5 mm) above the bottom of the stem.
H. After the actuator is mounted on a valve, place the stem lock plate (item 28) over the valve stem, then install the stem clamp (Item
27) on the valve stem.
1. Referring to Paragraph 2.3, position the stem clamp as required for valve seating and travel, then tighten the setscrew in the stem
clamp. Install the socket head cap screws (Item 23) with lockwashers (Item 24). Torque the fasteners to the value on the assembly
drawing.
J. Drill holes in the yoke as directed by the assembly drawing and install the indicator plate (Item 8 on the assembly drawing) and ID
plate (item 19 on the assembly drawing) using drive screws (Item 20 on the assembly drawing).
K. If necessary for size 100, 160, and 160-5 actuators, install a bushing (Item 41 on the assembly drawing) in the air inlet hole of the
cover.
L. Apply preload to the spring by rotating the spring adjuster.
M. Cycle the actuator slowly several times to verify that no binding occurs during operation. Pressurize the actuator from 80 to 100
psig (5.5 to 7 bar) and check for leaks. Binding, noise or leakage is not acceptable.
Recommended Spare Parts:
Diaphragm p/n 185988 See #14 Fig.1
O-Ring p/n 357801 See #35 Fig.1
O-Ring p/n 357802 See #36 Fig.1
Gasket p/n 356998 See #32 Fig.1
Seal p/n 357800 See #34 Fig.1
