Specifications

15
115-74 (Globe) / 1115-74 (Angle)
PRESSURE REDUCING / LOW FLOW BY-PASS VALVE
Automatically reduces a higher
inlet pressure to a constant lower
outlet pressure regardless of
changing flow rate and/or varying
inlet pressure. Equipped with a
low flow by-pass feature which
bypasses the main valve pressure
function for low flow conditions.
FIGURE PV20CB
DIRECT RELIEF CONTROL
FUNCTION
- Normally closed position, opens when
pressure reaches set-point.
FEATURES
- Responsive:
- Selectable spring ranges to allow for
accurate, easy to adjust pressure setting.
- Large diaphragm area
- 1/2" and 3/4" ports.
- Large seat area.
- Ease of Maintenance
- Can be serviced without removal from
line.
- Replacement of elastomer parts is usually
maximum required servicing.
OPERATION
The PV20CB is a normally closed,
diaphragm actuated, spring loaded, direct
acting regulator. The pressure set point is
adjustable within the spring range. Upstream
pressure is sensed under the diaphragm. As
upstream pressure increases, the diaphragm
pushes against the spring. The pilot stem/
seat is pulled towards the open position,
increasing flow through the pilot. As
upstream pressure decreases under the
diaphragm, the spring pushes the stem/seat
towards the closed position restricting flow
through the pilot. This sensitive
spring/diaphragm interaction closely tacks and
responds to changes in upstream pressure.
START-UP/ADJUSTMENT
Follow the start-up procedures
for the ACV function you have
selected.
1 - Turn the screw Clockwise (IN)
to increase the set-point you are
controlling.
2 - Turn the screw Counterclockwise
(OUT) to decrease the set-point you
are controlling.
A
CCESSORIES ❏ X - Isolation Cocks
Located as indicated ❏ Y - Y-Strainer
I
ncluded as marked ❏ FC - Flo-Clean Strainer
❏ P - Position Indicator
❏ L - Limit Switch
❏
ACS - Adjustable Closing Speed
COMPONENTS
1
. Main Valve
2. Low Flow By-Pass Control
3
. Pressure Reducing Control
4. Fixed Orifice
5
. Adj. Opening Speed (3” and Smaller)
ADJUSTMENT
S
CREW
NUT
A
DJUSTMENT
SCREW
COVER
SPRING
NUT
O-RING
UPPER CHAMBER
STEM
1/4" NPT
SPRING GUIDE
LOCKWASHER
SCREW
DIAPHRAGM
WASHER
DIAPHRAGM
LOWER CHAMBER
INNER COVER
O-RING
GASKET
DISC HOLDER
RUBBER DISC
FLAT WASHER
NUT
O-RING
SEAT
SPRING CAGE
1/2" & 3/4" NPT
TYP, BOTH
ENDS
O-RING
SENSE
PORT
1/8" NPT
BODY
ACV 115
Pressure Reducing
Valve
ACV PV20CB
Direct Relief Control
CLOSES VALVE
O
PENS VALVE
INSTALLATION
If the PV20CB is to be field
installed, follow the steps
below.
1 - Locate the flow arrow or
bridge marking and install the
control so the flow is under
the seat.
2 -Typical application shown
to the right: