DESCRIPTION
The 430-Z-3W valve maintains a minimum preset upstream
pressure regardless of changing demand. Differential pressure
operates the valve which utilizes a 3-way pressure sustaining
pilot to fix the main valve to maintain the upstream pressure
setpoint.
When upstream pressure is lower than the setting of the
pressure sustaining pilot, the pilot opens allowing inlet
pressure to be directed to the upper diaphragm/cover of the
main valve to close drip-tight. When upstream pressure
gradually rises above the setting of the pressure sustaining
pilot, the pilot blocks inlet pressure to the cover and opens the
cover pressure to atmosphere causing the main valve to open
and relieve the upstream pressure to maintain the desired pilot
set point.
The main valve is also equipped with a 3-way manual
selector. The manual selector allows the main valve to be
either open, fully closed, drip-tight or in automatic mode to
regulate upstream pressure.
INSTALLATION
1. Allow enough room around the valve assembly for
making adjustments and for future maintenance and
disassembly work.
2. Thoroughly flush the pipeline to remove dirt, scale, and
debris. Failure to perform this operation may render the
valve inoperable.
3. It is recommended that isolation gate valves be installed
upstream and downstream of the Bermad control valve to
allow for future maintenance operations.
4. Install the valve in the pipeline with the valve flow arrow
on the body casting in the proper direction. Install the
valve horizontally with the cover up for best performance.
Make certain the valve is positioned so the cover assembly
can be easily removed for future maintenance requirements.
5. After installation carefully inspect/correct any damaged
accessories, piping, tubing, or fittings.
IN LINE STATIC TEST
Open Valve Static Test
1. Create flow. Turn Manual Selector 26 knob to “Open” position.
CAUTION
: This will allow the valve to open w/no regulation.
Make sure this condition will not cause system damage!
2. Check for leaks at the flange connection, fittings, etc...
Closed Valve Static Test
1. Create flow. Turn Manual Selector 26 knob to “Closed” position.
2. Bleed air from cover by loosening “Closed” port fitting or cover
fitting/plug. Check the valve cover and diaphragm area for leaks.
Tighten fittings and nuts-bolts if necessary.
START-UP OPERATION
NOTE:
There must be available flow
through the valve and system
to check and adjust the valve. Set the desired upstream pressure by
boosting pump pressure, opening bypass, creating demand or
trapping the desired setting pressure to set the pilot 30A.
1. Turn manual selector 26 to “Auto” position.
2. Turn adjusting screw on sustaining pilot 30A in fully clockwise
(CW) until all spring tension is loaded. Main valve will close.
3. Open fully pipeline gate or butterfly valves if applicable.
Main valve should still remain closed.
4. Vent trapped air in the main valve cover by turning manual
selector 26 just slightly to the “Open” position to release air trapped
in the cover. Turn back to the “Auto” position.
5. Slowly turn adjusting screw on reducing pilot 30A (CCW)
until the valve just begins to open. Stop. Turn adjusting
screw 1/2 turn (CW) and tighten locknut.
6. Check the pilot setting by increasing and/or decreasing inlet
pressure to verify valve opens and closes accordingly.
7. To increase upstream pressure setting turn adj. screw in
clockwise (CW) and to decrease setting turn screw out counter-
clockwise (CCW). Manual selector 26 must be left in the
“Auto”-matic regulation Mode position to regulate upstream
pressure.
CONTROL LIST
4A. Filter
26.
3-Way Manual Selector
30A.
3-Way Pressure Sustaining Pilot
405-G Main Valve
430-Z-3W
7/00
Model 430-Z-3W Pressure Sustaining Valve with Manual Selector
CONTROL
VALVES
MODEL
INSTALLATION/OPERATION/MAINTENANCE
