OPERATING INSTRUCTIONS
MODEL PRS-05 THD
PRESSURE REDUCING VALVE
Phone: 973-340-9955 Fax: 973-340-9933
http://www.straval.com Email: [email protected]
Reassemble the spring chamber making sure the diaphragm is
properly located in its counterbore diameter in the spring cham-
ber, otherwise proper sealing is not achieved. One technique to
make sure the diaphragm stays seated in the spring chamber
counterbore during assembly is to place the spring chamber up-
side down with gravity keeping the spring hardware in place. The
body also in the upside down position can now be carefully
screwed into the spring chamber with the diaphragm properly
located. The spring chamber must be tightened with an adequate
sized wrench and tightened securely to achieve an adequate met-
al seal. If leakage occurs, retighten the spring chamber until the
leakage stops. If leakage still persists and the diaphragm is
properly seated, the only possibility left is a damaged seating
surface on the body such as scratches or nicks, or scratches or
defects in the diaphragm seating surface area.
After the valve is properly assembled, reset the adjusting screw
until the desired outlet pressure is achieved at the flow rage the
valve will be operating, then tighten the adjusting screw lock nut.
Note that some valves depending on the droop characteristic may
require readjustment of the spring setting for wide ranges in
flows, or where large changes in inlet pressure occur. Consult
factory for application assistance if a different valve is required.