V46 and V47 Repair Parts and Service Instructions
6
Servicing V46 and V47 3/8 in. through 1-1/2 in. Valves
1. Decrease the compression on the main spring by turning the range adjusting screw clockwise until it stops.
Using excessive force to turn the screw beyond the stop point strips the thread.
2. Remove the four screws holding the spring housing and remove the entire housing assembly. See Figure 2.
3. To improve the performance on 3/8 in. direct-acting valves, install the ISO-loss washer that is supplied with the
3/8 in. valve repair kit as follows:
Note:
Reverse-acting 3/8 in. valves do not require the ISO-loss washer.
a. Slightly squeeze the spring housing assembly to remove the spring housing.
b. Remove the range adjusting screw, spring, and valve spring guide (Figure 6).
c. Clean off any excess grease on the valve spring guide.
d. Place the new ISO-loss washer over the guide plate.
e. Replace the valve spring guide, spring, range, adjusting screw, and spring housing.
IMPORTANT:
To decrease the pressure in the sensing element on the V47 valve, cool the bulb by submerging
it in ice water. Do not remove the bulb from the ice water until the element is ready to be reinstalled. Otherwise,
the pressure increases in the sensing element, resulting in a valve that is hard to reassemble.
Risk of Personal Injury.
Protect eyes. Do not remove the two screws on the sides of the spring housing. Disassembly can cause a
compressed spring to fly out and may result in serious eye injuries, blindness, or other severe injury.
Figure 5: V46 and V47 3/8 in.
through 1-1/2 in. Valves
ISO-loss Washer
Guide Plate Gasket
Post
Disc Stud
Disc Cup
Valve Disc
Push Rod
