7
ES-A-ACV-LF920GD 2115
© 2021 Watts
LEAD FREE
*
* The wetted surface of this product contacted by consumable water
contains less than 0.25% of lead by weight.
Model LFPV20C
Pressure Relief, Sustaining or
Backpressure Pilot
Size:
1/2
" NPT
The Model LFPV20C is a remote sensed direct acting, diaphragm
actuated Pilot that is used on various configurations of Automatic
Control Valves.
It is normally held closed by the force of the adjustable spring
setting above the diaphragm. It modulates toward an open posi-
tion when control pressure, exerting force below the diaphragm,
exceeds the spring setpoint, and modulates toward a closed
position when the control pressure falls below the spring setpoint.
The LFPV20C senses control pressure through a tapped port
below the diaphragm. The large diaphragm-to-seat ratio allows
it to open and close within tight pressure tolerances, accurately
positioning the Main Valve.
Turning the adjustment screw clockwise raises the control set-
point. Turning the adjustment screw counterclockwise lowers the
control setpoint.
The LFPV20C is equipped with one
1/2
" NPT inlet and outlet port
and a
1/4
" NPT side sensing port located on the power chamber.
The
1/4
" side sensing port is used to monitor upstream or down-
stream pressure as required by specific valve function.
Body Material:
Lead Free Copper Silicon Alloy
Seat:
316
Stainless
Steel
Elastomers:
Buna-N
(standard)
Viton™
(optional)
EPDM
(optional)
Inlet Pressure Rating:
400psi (27.6 bar) maximum
Adjustment Rating:
20-200psi (1.4 - 13.8 bar) (standard)
0-30psi (0 - 2.1 bar) (optional)
100-300psi (6.9 - 20.7 bar) (optional)
200-450psi (13.8 - 31.0 bar) (optional)
Specifications
Model LFPV20C
Sense Port
Outlet
Inlet
1
2
3
4
5
7
9
10
11
8
6
12
13
14
16
17
18
19
20
21
15
17
7.30
1.00
3.50
Item
Description
1
Adjusting Screw
2
Jam Nut
3
Spring Housing
4
Spring Guide
5
Spring
6
Cap Screw
7
Power Chamber
8
O-Ring*
9
Body
10
Seat
11
O-Ring*
Item
Description
12
Nut
13
Lockwasher
14
Diaphragm Washer
15
Diaphragm*
16
Diaphragm Washer
17
O-Ring*
18
Stem
19
Retainer
20
Rubber Disc*
21
Screw
*Included in Repair Kit
Viton™ is a trademark of The Chemours Company FC, LLC
