Lead Free Water Pressure Reducing Valves (PRV

Lead Free Water Pressure Reducing Valves (PRV
Lead Free Water Pressure Reducing Valves (PRV)
Models T-6800NL,T-6801NL and T-6803NL Installation Instructions
Figure 1 (Typical Installation)
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. M
UST 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 Pressconnection 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.
WARNING:
Conduct a thorough inspection of the PRV for external leaks after the final installation and
adjustment.
Figure 2
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:
T-6800NL
T-6801NL
T-6803NL
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 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-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 counterclockwise 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 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
Figure 3
T-6800NL
Cut-away
ANSI / NSF 61-F and 61-G
ANSI / NSF 372
1003
No. Part
1 Adjustment bolt
2 Lock nut
3
Bonnet
4
5
6
7
8
Anti-friction ring
Spring disc
Spring
Diaphragm nut
Diaphragm disc
9
Diaphragm
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
Stem
Rubber ball
Ball retaining screw
Stem O-ring
Body
Union nut
Union tail piece
Union washer
Strainer screen
Seat O-ring
Seat
Plunger washer
Plunger seat
Plunger
Service cap O-ring
Service cap
Name plate
Strainer cap O-ring
Strainer service cap
Spring washer
Material
Cadmium Plated Steel
Cadmium Plated Steel
Cast brass or Polycarbonate resin, glass-fiber
reinforced
Zinc Plated Steel
Zinc Plated Steel
Cold Drawn Steel Wire
Cadmium Plated Steel
Zinc Plated Steel
Reinforced NBR
(Buna-N) Rubber
Lead-Free Forged Brass
NBR (Buna-N) Rubber
Stainless Steel
NBR (Buna-N) Rubber
Lead-Free Cast Brass
Cast Brass
Lead-Free Forged Brass
NBR (Buna-N) Rubber
Stainless Steel
NBR (Buna-N) Rubber
Stainless Steel
Stainless Steel
NBR (Buna-N) Rubber
Lead-Free Forged Brass
NBR (Buna-N) Rubber
Lead-Free Forged Brass
Aluminum
NBR (Buna-N) Rubber
Lead-Free Forged Brass
Cold Drawn Steel
Specification
ASTM A283-D
AISI-1010
ASTM B584 UNS C85700
(brass)
Commercial grade (resin)
ASTM A283-D
ASTM A283-D
ASTM A227M-91
AISI-1010
ASTM A283-D
Commercial grade,
Nylon-reinforced
UNS Alloy C46400
Commercial grade
AISI 304
Commercial grade
UNS Alloy C87850 Eco Brass
ASTM B584 UNS C85700
UNS Alloy C46400
Commercial grade
AISI 304
Commercial grade
AISI 304
AISI 304
Commercial grade
UNS Alloy C46400
Commercial grade
UNS Alloy C46400
ASTM B209 1100
Commercial grade
UNS Alloy C46400
ASTM A227M-91
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 diaphragm nut (7), 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. Hold the diaphragm nut (7) with a 13 MM wrench. With a large flat-blade screwdriver, loosen counterclockwise and detach the plunger (22) from the stem (10).
H. Remove the plunger washer (20) and plunger seat (21) by separating them from the plunger. Replace with
the correct seat material and size. Re-assembly is in the reverse-order.
Figure 4
28
23
25
26
To replace the diaphragm (9):
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 counterclockwise and detach the plunger (23) from the stem (10).
G. Using your index finger, push the bottom of the stem (10, where the plunger was installed) upward to detach
the stem and diaphragm (9) assembly out of the valve’s body.
H. Secure the 22 MM hex-shaped portion of the stem (10) that is directly underneath the diaphragm (9) using a
22 MM deep-well socket and ratchet or breaker-bar. Prevent the stem from rotating as you loosen counterclockwise, and detach the diaphragm nut (7) using a 17 MM wrench.
I. Remove the spring washer (29), diaphragm disc (8) and diaphragm (9) by lifting them off of the stem.
Replace with the correct diaphragm. Re-assembly is in the reverse-order. Apply one drop of low-strength
thread-locking compound to the male threads of the stem prior to attaching the diaphragm nut.
Models T-6801NL 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 diaphragm nut (7), 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, 19, 20, 21, 22, 24, 25 and 26 assembled as one piece. See Figure 4.
G. Hold the diaphragm nut (7) with a 13 MM wrench. With a large flat-blade screwdriver, loosen counterclockwise and detach the plunger (22) from the stem (10).
H. With one hand, hold the carrier assembly firmly. With the thumb of the free hand, push the bottom of the
stem (10) and diaphragm (9) out of the carrier sleeve (24)
I. Secure the 18 MM hex-shaped portion of the stem (10) that is directly underneath the diaphragm (9) using an
18 MM deep-well socket and ratchet or breaker-bar. Prevent the stem from rotating as you loosen counterclockwise, and detach the diaphragm nut (7) using a 13 MM wrench.
J. Remove the spring washer (25), diaphragm disc (8) and diaphragm (9) by lifting them off of the stem.
Replace with the correct diaphragm. Re-assembly is in the reverse-order. Apply one drop of low-strength
thread-locking compound to the male threads of the stem prior to attaching the diaphragm nut.
Adjustment:
CAUTION! Post-adjusted pressure MUST be verified! A pressure gauge should be installed downstream to
verify the pressure setting. All models are factory pre-set at 50 psi.
To adjust the pressure:
1. With a 17 MM (13 MM on Models T-6801NL & T-6803NL) open-end wrench, loosen the locknut (2) by
turning counter-clockwise.
2. With a 17 MM (13 MM on Models T-6801NL & T-6803NL) wrench or socket, turn the adjustment bolt (1)
CLOCKWISE to INCREASE the outlet pressure or COUNTER-CLOCKWISE to DECREASE outlet pressure.
3. After adjustment and pressure verification, tighten the locknut by turning clockwise until it is firmly-seated
against the top of the bonnet. DO NOT OVER-TIGHTEN!
Maximum inlet pressure: 300 CWP
Maximum temperature: 180° F
Reduced pressure adjustment range: 25 to 75 psi.
27
24
20
22 21
T-6801NL
Cut-away
No. Part
1 Adjustment bolt
2 Lock nut
3
Bonnet
4
5
6
7
8
Anti-friction ring
Spring disc
Spring
Diaphragm nut
Diaphragm disc
9
Diaphragm
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
Stem
Check-ball
Ball retaining screw
Stem O-ring
Body
Union nut
Union tailpiece
Union washer
Strainer screen
Seat O-ring
Plunger washer
Plunger seat
Plunger
Identification plate
Carrier sleeve
Spring washer
Body-sleeve O-ring
Upper sleeve O-ring
28
Thrust collar
T-6803NL
Cut-away
Material
ASTM A283-D
AISI-1010
Cast brass or
Polycarbonate resin,
glass-fiber reinforced
Stainless steel
Zinc plated steel
Cold-drawn steel wire
Cadmium plated steel
Zinc plated steel
Reinforced NBR
(Buna-N) rubber
Lead-free forged brass
NBR (Buna-N) rubber
Stainless steel
NBR (Buna-N) rubber
Lead-free cast brass
Cast brass
Lead-free forged brass
NBR (Buna-N) rubber
Stainless steel
NBR (Buna-N) rubber
Stainless steel
NBR (Buna-N) rubber
Lead-free forged brass
Aluminum
Polycarbonate resin
Cold-drawn steel
NBR (Buna-N) rubber
NBR (Buna-N) rubber
Polycarbonate resin,
glass-fiber reinforced
Specification
ASTM B584 C85700 (brass)
Commercial grade (resin)
AISI 304
ASTM A283-D
ASTM A227M-91
AISI-1010
ASTM A283-D
Commercial grade,
Nylon-reinforced
UNS Alloy C46400
Commercial grade
AISI 304
Commercial grade
UNS Alloy C87850 Eco brass
ASTM B584 UNS C85700
UNS Alloy C46400
Commercial grade
AISI 304
Commercial grade
AISI 304
Commercial grade
UNS Alloy C46400
ASTM B209 1100
Commercial grade
ASTM A227M-91
Commercial grade
Commercial grade
Commercial grade
Note: Shaded components make up the carrier assembly. See step F.
By-pass Feature:
All models feature a built-in thermal expansion by-pass. This feature prevents downstream pressure from
rising to more than 10 psi above the supply pressure.
Troubleshooting - High System Pressure:
WARNING! All plumbing components within the distribution system MUST be protected against excess
pressure, where the addition of a pressure relief valve of the appropriate type, may be required. The installer
is responsible for knowing and complying with all local or National code requirements pertaining to pressure
relief.
If the downstream system pressure is higher than the set pressure under no flow conditions, the cause could
be thermal expansion, pressure creep or dirt/debris on the seat.
Thermal expansion occurs whenever water is heated in a closed system. The system is closed when supply
pressure exceeds 150 psi, or a check valve or backflow preventer is installed in the supply piping.
ANSI / NSF 61-F and 61-G
ANSI / NSF 372
1003
• For a submittal sheet, please visit us
at www.legendvalve.com
• Please contact Legend Technical
at 800-752-2082 with additional
questions.
Rev. 1.15
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