Lead Free Water Pressure Reducing Valves (PRV)
Models T-6800NL, T-6801NL, T-6802NL and T-6803NL Installation Instructions
Figure 1 (Typical Installation)
Figure 2
Figure 3
WARNING:
Conduct a thorough inspection of the PRV for external leaks after the
final installation and adjustment.
T-6800NL
T-6801NL
T-6803NL
T-6802NL
T-6800NL
Cut-away
No.
Part
Material
Specification
1
Adjustment bolt
Cadmium Plated Steel
ASTM A283-D
2
Lock Nut
Cadmium Plated Steel
AISI-1010
3
Bonnet
Cast brass or Polycarbonate resin, glass-fiber
reinforced
ASTM B584 UNS C85700
(brass) Commercial grade (resin)
4
Anti-friction ring
Zinc Plated Steel
ASTM A283-D
5
Spring disc
Zinc Plated Steel
ASTM A283-D
6
Spring
Cold Drawn Steel Wire
ASTM A227M-91
7
Diaphragm nut
Cadmium Plated Steel
AISI-1010
8
Diaphragm disc
Zinc Plated Steel
ASTM A283-D
9
Diaphragm
Reinforced NBR (Buna-N) Rubber
Commercial grade, Nylon-reinforced
10
Stem
Lead-Free Forged Brass
UNS Alloy C46400
11
Check ball
NBR (Buna-N) Rubber
Commercial grade
12
Ball retaining screw
Stainless Steel
AISI 304
13
Stem O-ring
NBR (Buna-N) Rubber
Commercial grade
14
Body
Lead-Free Cast Brass
UNS Alloy C87850 Eco Brass
15
Union nut
Cast Brass
ASTM B584 UNS C85700
16
Union tail piece
Lead-Free Forged Brass
UNS Alloy C46400
17
Union washer
NBR (Buna-N) Rubber
Commercial grade
18
Strainer screen
Stainless Steel
AISI 304
19
Seat O-ring
NBR (Buna-N) Rubber
Commercial grade
20
Seat
Stainless Steel
AISI 304
21
Plunger washer
Stainless Steel
AISI 304
22
Plunger seat
NBR (Buna-N) Rubber
Commercial grade
23
Plunger
Lead-Free Forged Brass
UNS Alloy C46400
24
Service cap O-ring
NBR (Buna-N) Rubber
Commercial grade
25
Service cap
Lead-Free Forged Brass
UNS Alloy C46400
26
Name plate
Aluminum
ASTM B209 1100
27
Strainer cap O-ring
NBR (Buna-N) Rubber
Commercial grade
28
Strainer service cap
Lead-Free Forged Brass
UNS Alloy C46400
29
Spring washer
Cold Drawn Steel
ASTM A227M-91
Application:
Typically installed between the water main and a building’s water distribution system, on the water service line,
to reduce and maintain incoming water pressure (see Fig. 1). All models are suitable for no-lead potable water
installations, in full compliance of all lead-free plumbing laws.
Installation Requirements:
1.
MUST
be installed in accordance with all local codes and ordinances.
2.
MUST
be installed in an accessible location on the service line, with sufficient clearance for maintenance and
adjustment.
3. Models with brass bonnets are designed for outdoor use. Models with reinforced plastic bonnets should not be
installed outdoors where prolonged exposure to sunlight and temperature extremes could result in damage.
4. Prior to installation, the service line
MUST
be flushed, to remove all loose scale, dirt, debris or other foreign
matter. Failure to do so could result in damage or clogging of the valve.
Basic Installation:
1. Connection types vary between each model and may include FNPT, Sweat, PEX, CPVC solvent-weld or Press-
connection types. Where applicable, the installation tool manufacturers’ instructions should be followed. In
all other cases, good industry practice should be followed (e.g. proper thread engagement and tightening, or
correct soldering technique).
2. The T-6800NL model’s end connections are marked “IN” and “OUT”. All models have a flow direction arrow
cast onto their bodies. Make sure to install them with the arrow pointing in the direction of flow (see Fig. 2).
Valve inlet (“IN”): Upstream, high-pressure service line. Valve outlet (“OUT”): Downstream, reduced-pressure
distribution system.
3. All models can be installed in the vertical or horizontal positions, upright or inverted. When installed
horizontally, it is recommended that they’re oriented upright, positioning the adjustment bolt upward, which
eases servicing and adjustment.
4. When placing into service, apply water pressure gradually. Check for leaks at all connections.
Maintenance Instructions:
Inspect the entire system annually. Make sure all safety and control valves are functioning correctly and that the
entire system is leak-free.
See Figures 3 and 4 for numbered component identification, for the following maintenance procedures:
To clean the inlet strainer screen (18):
Model T-6800NL
A. Shut off water supply and relieve system pressure.
B. Loosen and remove the strainer service cap (28) by turning counter-clockwise.
C. Remove and clean or replace the mesh strainer screen (18)
D. Re-install the mesh strainer, making sure it is seated properly.
E. Inspect the strainer cap O-ring (27) for damage. Replace if necessary. Re-install the strainer cap.
Models T-6801NL, T-6802NL and T-6803NL
A. Shut off water supply and relieve system pressure.
B. Loosen locknut (2) first, and then adjustment bolt (1) by turning both counter-clockwise at least two complete
revolutions.
C. Loosen and detach the bonnet (3) by un-threading it counter-clockwise.
D. Remove the following components that are contained within the bonnet: anti-friction ring (4), spring disc (5)
and spring (6).
E. With a pair of pliers, grip the 13 MM diaphragm nut,
from the top, using the tips of the pliers’ jaws
(
don’t
grip the nut’s flats from the side, as if loosening the nut).
F. Firmly pull out the entire carrier assembly from the body of the valve. The carrier assembly is comprised of parts
7, 8, 9, 10, 11, 12, 13, 18 (strainer screen) 19, 20, 21, 22, 24, 25 and 26 assembled as one piece. See Figure 4.
G. Remove and clean or replace the mesh strainer screen (18)
H. Re-install the clean mesh strainer into the body (14) making sure it is centrally-seated into the machined
pocket.
I. Inspect the upper sleeve O-ring (27) verifying that it is free of debris or damage and properly seated within the
body (14).
J. Re-install the carrier assembly into the body (14). Make sure to seat it in completely, by firmly pushing down
onto the top of the stem with your thumb.
K. Once seated, with your fingertips, work the outer edges of the diaphragm (9) into the body until its entire
circumference is evenly-seated.
CAUTION!
The female threads that accept the male threads of the bonnet (3)
are sharp! Be careful not to cut your fingers when pushing the diaphragm down.
DO NOT
use tools or sharp
objects to seat the diaphragm! Remaining assembly is in the reverse-order.
To replace the plunger seat (T-6800NL: 22, T-6801NL, T-6802NL & T-6803NL 21):
Model T-6800NL
A. Shut off water supply and relieve system pressure.
B. Loosen locknut (2) first, and then adjustment bolt (1) by turning both counter-clockwise at least two complete
revolutions.
C. Loosen and detach the bonnet (3) by un-threading it counter-clockwise.
D. Remove the following components that are contained within the bonnet: anti-friction ring (4), spring disc (5)
and spring (6).
E. Loosen and remove the service cap (25) by turning counter-clockwise.
F. Hold the diaphragm nut (7) with a 17 MM wrench. With a large flat-blade screwdriver, loosen counter-clockwise
and detach the plunger (23) from the stem (10).
G. Remove the plunger washer (21) and plunger seat (22) by separating them from the plunger. Replace with the
correct seat material and size. Re-assembly is in the reverse-order.
Models T-6801NL, T-6802NL and T-6803NL
A. Shut off water supply and relieve system pressure.
B. Loosen locknut (2) first, and then adjustment bolt (1) by turning both counter-clockwise at least two complete
revolutions.
Continued on the reverse page
Rev. 12.15
