Hydro Instruments PRV-71H Series User manual

Series PRV Rev. 9/27/19
Series PRV-71H Pressure Reducing Valve
Operation and Maintenance Manual
All Hydro Instruments Chemical Feed systems are carefully
designed and tested for years of safe, accurate field service.
All Hydro Instruments systems are tested prior to shipment.
All Hydro Instruments products are made of the finest materials.
To ensure best operation, read these instructions carefully and
completely and store them where all maintenance personnel will
have access to them.
1

Pressure Reducing Valve Operation and Maintenance Manual
Table of Contents
I. Manually Set Pressure Reducing Valve
1. Introduction...............................................................................................3
2. Installation.................................................................................................3
3. Operation...................................................................................................3
4. Maintenance..............................................................................................3
II. Electronically Actuated Pressure Reducing Valve
1. Introduction...............................................................................................4
2. Installation.................................................................................................4
3. Operation...................................................................................................4
4. Maintenance..............................................................................................5
Parts drawings ................................................................................................. 6-13
Dimensional drawings .................................................................................. 14-15
Circuit Board drawing.........................................................................................16
PRV-71H Torque Specifications
Item ft./lbs.
Lower End Cap 200
Hex Head Screws and Nuts 80
General Specifications
Maximum Pressure: 600 PSI (41 Bar)
Outlet Pressure Range: 0-45 PSI (0-3 Bar)
(See Section I.4 for manual PRVs & Section II.4 for
Actuated PRVs for more information.)
Operating Temperature: -15°F (-26°C) to 225°F (107°C)
*Operating Temperature: -15°F (-26°C) to 150°F (65°C)
Inlet/Outlet Connections: ¾" FPT or 1" FPT
Vent Connection: ¼" FPT
(See Section I.2 for manual PRVs & Section II.2 for
Actuated PRVs for more information on installing the vent
connection.)
Mounting: Inline or wall mounted with PRH-353A-8000 mounting
bracket.
Capacity: 8000 PPD Cl2or SO2(4000 PPD NH3)
12,000 PPD Cl2or SO2(6000 PPD NH3)
*Power: 120VAC or 240VAC, 50/60 Hz
* Relay/Limit Switch: 1 NO or NC, 22 Amps
* For electronically actuated PRVs only.
2

I. MANUALLY SET PRESSURE REDUCING VALVE
1. INTRODUCTION
The PRV-71H (manually operated) is a normally open, spring loaded, diaphragm type, self actuating pressure
reducing valve. Its purpose is to reduce and control downstream pressure between 15 to 45 psig by the manual
adjustment of the adjustment screw. The valve will close if downstream pressure exceeds the set pressure.
The upper valve body is provided with a 1⁄4" FNPT vent connection. If the diaphragm fails, the pressurized gas
can be directed to an appropriate location by use of the vent connection.
The PRV-71H design incorporates a removable trim capsule assembly, allowing for easy maintenance and
cleaning.
2. INSTALLATION
Because of its weight, the PRV-71H (manually operated) should always be supported. An optional wall-
mounting bracket is available and includes four 3⁄8" x 1" wall mounting slots. The PRV should be installed in
the upright position.
Inlet and outlet connections are 3⁄4" or 1" female NPT depending on the model chosen. A label is provided
to show the direction of flow and help identify the inlet and outlet. Note that the outlet connection and vent
connection are on the same side of the valve. There is also a 1⁄4" FNPT vent connection on the top body of the
PRV in case of diaphragm failure. The vent line should be 1⁄2" schedule 80 carbon steel pipe and slope at least 2
degrees downward to prevent water/moisture entry. An insect screen must also be installed on the outlet of the
vent piping to prevent insects from blocking the pipeline.
The valve should be installed downstream of the chlorine filter and liquid traps (drip legs).
A pressure gauge should always be installed in the downstream piping to indicate the reduced pressure.
3. OPERATION
The outlet pressure is adjustable by means of the Adjustment Screw (PRH-396G-8000). By rotating the
Upper End Cap (PRH-378U-8000) the user can access the adjustment screw. Turning the Adjustment Screw
allows the user to increase (clockwise) or decrease (counterclockwise) the compression on the Loading
Spring (SPH-424A-8000) thus controlling how much the valve opens. Turning the Adjustment Screw
clockwise will increase the tension on the loading spring, thus increasing the outlet pressure and turning it
counterclockwise will decrease the outlet pressure. Adjustments should be made slowly and carefully, while
monitoring the pressure with a pressure gauge installed on the downstream side of the pressure reducing valve.
4. MAINTENANCE
The frequency of required cleaning or maintenance will depend on the quality of the gas supply and the gas
flow rate. However, it is recommended that that the valve be serviced at least once per year.
Parts/Maintenance Kits are offered and contain the parts necessary to accomplish the recommended mainte-
nance as well as a parts diagram.
Note: Please refer to the parts diagram for those items included in the Part & Maintenance Kits.
Maximum Discharge Pressure Settings to Prevent Liquifaction
Cl2Service: 40 psig (275 kPa guage)
SO2Service: 15 psig (103 kPa guage)
NH3service: 40 psig (275 kPa guage)
3

II. ELECTRONICALLY ACTUATED PRESSURE REDUCING VALVE
1. INTRODUCTION
The PRV-71H (electronically operated) is an electronically actuated, spring loaded diaphragm type gas pres-
sure reducing and shut-off valve. Its purpose is to reduce and control downstream pressure between 15 to 45
psig. The outlet pressure is manually adjusted by the position of the lock nuts. The electronic actuator is spring
loaded normally closed and upon loss or disconnection of power, then the spring will move the pressure reduc-
ing valve to the closed position. Upon recieving or restoring power, the electronic actuator will close an inter-
nal solenoid valve and start an internal motor driven pump that is used to force the ram down until it reaches the
manually set operating position.
2. INSTALLATION
Because of its weight the PRV-71H (electronically operated) should always be supported. An optional wall-
mounting bracket is available for fast and easy installation. This wall mounting bracket includes four 3⁄8"x 1"
mounting slots. The PRV should be installed in the upright position.
Inlet and outlet connections to the pressure reducing valve are 3⁄4" or 1" FNPT depending on the model chosen.
A label is provided to indicate the direction of flow and help identify the inlet and the outlet. There is also a
1⁄4" FNPT vent connection above the outlet connection in case of diaphragm failure and it is recommended that
1⁄2" schedule 80 carbon steel vent piping be used. Vent piping should also slope downward at least 2 degrees to
prevent water/moisture entry and an insect screen must be installed on the vent pipeline outlet to prevent insects
from blocking the pipeline.
The installation of this valve should be downstream of any chlorine filters and drip legs, and a pressure gauge
should be mounted on the downstream side of the valve to monitor outlet pressure.
Depending on the model, the electronic actuator will require either a 120 or 240 VAC (50/60 Hz) single phase
power supply connected to the line terminals on the actuator unit with the ground line connected to the screw
underneath the common (COM). The unit also includes a contact relay offering both normally open (N.O.) and
normally closed (N.C.) connections, and their proper wiring location can be seen on the valve. To get remote
closure of the actuator based on an alarm condition, wire a SPST switch into the L1 (phase) side of the power
line. When operating, the valve operator requires 170 VA.
3. OPERATION
With voltage applied to the electronic actuator, an internal solenoid valve will close and a motor driven pump
will apply pressure to a spring loaded piston. The ram valve which is connected to this piston will move down
into position set by the lock nuts. Once the lock nuts hit the bottom of the yoke, the resistance will be picked
up by the actuator and the motor will stop, holding the ram valve in place. Thus, the downstream pressure is set
by the position of the lock nuts. Lowering the lock nuts will reduce the amount of tension applied to the load-
ing spring, lowering downstream pressure, while raising the lock nuts will increase the tension applied to the
loading spring, increasing the downstream pressure.
Warning: Do not adjust the lock nuts while the actuator is on. Doing so will result in damage of the actuator.
To adjust the outlet pressure remove from power source and adjust, then re-apply power to get new pressure set-
ting. Repeat until the correct outlet pressure is achieved
When in position, the ram valve compresses an internal spring, which in turn presses down on a diaphragm and
opens up the orifice between the valve seat and valve plug. This opening allows for gas to enter through the
reducing valve at a controlled pressure. Downstream pressure is regulated by the counteracting forces on the
diaphragm between the spring and the gas. For example, when flow demand is increased there will be less force
acting up on the diaphragm. This will allow the spring to expand down more, enlarging the orifice and allowing
more gas flow into the regulator in order to establish a new diaphragm equilibrium position.
When power is lost, the solenoid valve will open and the ram valve will go up out of contact with the loading
spring. This removes tension on the loading spring, causing the diaphragm to move up and the pressure reduc-
ing valve to close.
4

4. MAINTENANCE
The frequency of required cleaning or maintenance will depend on the quality of the gas supply and the gas
flow rate. However, it is recommended that the valve be serviced at least once per year.
The electronic actuator does not require any routine maintenance and should not be tampered with unless by
factory trained personnel. If you are experiencing problems with the actuator contact Hydro Instruments or
your local Hydro Instruments sales representative. If the actuator no longer is able to open the valve, then it
may require replacement.
Parts/Maintenance Kits are offered and contain the parts necessary to accomplish the recommended mainte-
nance as well as a parts diagram.
Note: Please refer to the parts diagram for those items included in the Part &Maintenance Kits.
Maximum Discharge Pressure Settings to Prevent Liquifaction
Cl2Service: 40 psig (275 kPa guage)
SO2Service: 15 psig (103 kPa guage)
NH3service: 40 psig (275 kPa guage)
5

19
A
24
A/B
26
A/B/C
27
A/B/C
29
A/B
19
B
20
3
4
11
2
1
8
9
10
17
18
5
6
7
16
25
28
30
31
23
22
21
A/B/C
11
12
14
15
13
15
12
14
13 15
Date: 2018-01-05-v1
EXPLODED VIEW
Dwg. No. PRV-71H, EXP
PRESSURE REDUCING
AND SHUTOFF VALVE
6

Date: 2018-01-05-v1
BILL OF MATERIALS
Dwg. No. PRV-71H, BOM
PRESSURE REDUCING
AND SHUTOFF VALVE
Item Part
No. Description Quantity No.
1 Upper End Cap 1 PRH-378U-8000
2 Adjustment Screw 1 PRH-396G-8000
3 Mounting Bracket 1 PRH-353A-8000
4 PM Upper End Cap Lead Gasket 1 GAH-LED-333
5 Hex Head Screw, 3⁄8-16 x 13⁄4" 6 BTH-STA-040F
6 Upper Valve Body 1 PRH-23076-8000
7 Seat Cap and Seat Cap Bushing Assembly 1
8 Seat Cap (pre-assembled with bushing) 1 PRH-640A-8000
9 Seat Cap Bushing (pre-assembled with cap) 1 PRH-640B-8000
10 Loading Spring 1 SPH-424A-8000
11
3⁄4-16 Brass Hex Nut 2 PRH-397A-8000
12 Diaphragm Backing Plate 1 PRH-391G-8000
13 Diaphragm Backing Plate (with o-ring groove) 1 PRH-392G-8000
14 PM Set of Two Diaphragms 1 DIH-425C-8000
15 PM O-Ring 2 OH-VIT-020
16 Diaphragm Bolt and Diaphragm Bolt Base Assembly 1 PRH-639A-8000
17 Diaphragm Bolt (pre-assembled, press fit with base) 1
18 Diaphragm Bolt Base (with o-ring groove)
(pre-assembled, press fit with bolt) 1
19A Lower Valve Body (3⁄4") 1 PRH-23077-8000
19B Lower Valve Body (1") 1 PRH-23077-12000
20 Hex Nut,
3⁄8-16 6 BTH-STA-145M
21A * Trim Capsule Assembly (8000 PPD) 1 PRH-668-8000
21B * Trim Capsule Assembly (12,000 PPD) 1 PRH-668-12000
21C * Trim Capsule Assembly (16,000 PPD) 1 PRH-668-16000
22 PM Gasket 1 GAH-334C-8000
23 PM Valve Screen 1 PRH-433S-8000
24A Valve Body Capsule (8000 PPD) 1 PRH-433A-8000
24B Valve Body Capsule (12,000 PPD & 16,000 PPD) 1 PRH-433A2-12000
25 Pin 1 PRH-398A-8000
26A PM Valve Seat (8000 PPD) 1 PRH-433F-8000
26B PM Valve Seat (12,000 PPD) 1 PRH-433F2-12000
26C PM Valve Seat (16,000 PPD) 1 PRH-433F3-16000
27A Valve Plug (8000 PPD) 1 PRH-433C-8000
27B Valve Plug (12,000 PPD) 1 PRH-433C2-12000
27C Valve Plug (16,000 PPD) 1 PRH-433C3-16000
28 Trim Spring 1 SPH-424B-8000
29A Spring Seat Cap (8000 PPD) 1 PRH-378D-8000
29B Spring Seat Cap (12,000 PPD & 16,000 PPD) 1 PRH-378D2-12000
30 PM Lower End Cap Lead Gasket 1 GAH-LED-334
31 Lower End Cap 1 PRH-378L-8000
PM Part & Maintenance Kit (8000 PPD) KTH-PRV-71H-CL2-2
PM Part & Maintenance Kit (12,000 PPD) KTH-PRV-71H-CL2-3
PM Part & Maintenance Kit (16,000 PPD) KTH-PRV-71H-CL2-4
* Replacement requires new GAH-LED-334
7

25
A
25
B
26 14
15
16
17
23
11
13
22
10
1
2
3
4
5
6
7
8
9
28
29
30
A/B
31
32
A/B/C
33
A/B/C
34
35
36
37
27
A/B/C
20
21
21
18
19
12
24
19
18
20
21
Date: 2019-09-27-v1
EXPLODED VIEW
Dwg. No. PRV-71H-ELE, EXP
ELECTRONIC PRESSURE REDUCING
AND SHUTOFF VALVE
8

Date: 2019-09-27-v1
BILL OF MATERIALS
Dwg. No. PRV-71H-ELE, BOM
ELECTRONIC PRESSURE REDUCING
AND SHUTOFF VALVE
Item Part
No. Description Quantity No.
1A Actuator (120 V) 1 PRHA-766-120
1B Actuator (240 V) 1 PRHA-1025-240
2 Stem Nut 1 PRH-142E-000
3 Hex Nut, Actuator 1 BTH-STA-AN
4 Set Screw, 5-40 x 1⁄8", SS 2 BTH-STA-54018
5 Locking Nuts, HCX, 5⁄8-18 2 BTH-STA-5818
6 Valve Ram Stem 1 PRH-433E-000
7 Valve Gland 1 PRH-433G-000
8 PM O-Ring 1 OH-VIT-212
9 PM O-Ring 1 OH-VIT-114
10 Mounting Bracket 1 PRH-353A-8000
11 Hex Head Screw, 3⁄8-16 x 13⁄4" 6 BTH-STA-040F
12 Upper Valve Body, Electronic 1 PRH-23078-12000
13 Seat Cap and Seat Cap Bushing Assembly, Electronic 1
14 Seat Cap, Electronic (pre-assembled with bushing) 1 PRH-640A2-12000
15 Seat Cap Bushing (pre-assembled with cap) 1 PRH-640B-8000
16 Loading Spring 1 SPH-424A-8000
17
3⁄4-16 Brass Hex Nut 1 PRH-397A-8000
18 Diaphragm Backing Plate 1 PRH-391G-8000
19 Diaphragm Backing Plate (with o-ring groove) 1 PRH-392G-8000
20 PM Set of Two Diaphragms 1 DIH-425C-8000
21 PM O-Ring 2 OH-VIT-020
22 Diaphragm Bolt and Diaphragm Bolt Base Assembly 1 PRH-639A-8000
23 Diaphragm Bolt (pre-assembled, press fit with base) 1
24 Diaphragm Bolt Base (with o-ring groove)
(pre-assembled with bolt) 1
25A Lower Valve Body (3⁄4") 1 PRH-23077-8000
25B Lower Valve Body (1") 1 PRH-23077-12000
26 Hex Nut,
3⁄8-16 6 BTH-STA-145M
27A * Trim Capsule Assembly (8000 PPD) 1 PRH-668-8000
27B * Trim Capsule Assembly (12,000 PPD) 1 PRH-668-12000
27C * Trim Capsule Assembly (16,000 PPD) 1 PRH-668-16000
28 PM Gasket 1 GAH-334C-8000
29 PM Valve Screen 1 PRH-433S-8000
30A Valve Body Capsule (8000 PPD) 1 PRH-433A-8000
30B Valve Body Capsule (12,000 PPD & 16,000 PPD) 1 PRH-433A2-12000
31 Pin 1 PRH-398A-8000
32A PM Valve Seat (8000 PPD) 1 PRH-433F-8000
32B PM Valve Seat (12,000 PPD) 1 PRH-433F2-12000
32C PM Valve Seat (16,000 PPD) 1 PRH-433F3-16000
33A Valve Plug (8000 PPD) 1 PRH-433C-8000
33B Valve Plug (12,000 PPD) 1 PRH-433C2-12000
33C Valve Plug (16,000 PPD) 1 PRH-433C3-16000
34 Trim Spring 1 SPH-424B-8000
35A Spring Seat Cap (8000 PPD) 1 PRH-378D-8000
35B Spring Seat Cap (12,000 PPD & 16,000 PPD) 1 PRH-378D2-12000
36 PM Lower End Cap Lead Gasket 1 GAH-LED-334
37 Lower End Cap 1 PRH-378L-8000
PM Part & Maintenance Kit (8000 PPD) KTH-PRV-71H-CL2-2
PM Part & Maintenance Kit (12,000 PPD) KTH-PRV-71H-CL2-3
PM Part & Maintenance Kit (16,000 PPD) KTH-PRV-71H-CL2-4
* Replacement requires new GAH-LED-334
9

19
A
24
A/B
26
A/B/C
27
A/B/C
29
A/B
19
B
20
3
4
11
2
1
8
9
10
17
18
5
6
7
16
25
28
30
31
23
22
21
A/B/C
11
12
14
15
13
15
12
14
13 15
Date: 2018-01-15-v1
EXPLODED VIEW
Dwg. No. PRV-71H-NH3, EXP
PRESSURE REDUCING
AND SHUTOFF VALVE (AMMONIA)
10

Date: 2018-01-15-v1
BILL OF MATERIALS
Dwg. No. PRV-71H-NH3, BOM
PRESSURE REDUCING
AND SHUTOFF VALVE (AMMONIA)
Item Part
No. Description Quantity No.
1 Upper End Cap 1 PRH-378U-8000
2 Adjustment Screw 1 PRH-396G-8000
3 Mounting Bracket 1 PRH-353A-8000
4 PM Upper End Cap Lead Gasket 1 GAH-LED-333
5 Hex Head Screw, 3⁄8-16 x 13⁄4" (Stainless) 6 BTH-STA-040F-SS
6 Upper Valve Body 1 PRH-23076-8000
7 Seat Cap and Seat Cap Bushing Assembly 1
8 Seat Cap (pre-assembled with bushing) 1 PRH-640A-8000
9 Seat Cap Bushing (pre-assembled with cap) 1 PRH-640B-8000
10 Loading Spring 1 SPH-424A-8000
11
3⁄4-16 Brass Hex Nut 2 PRH-397A-8000
12 Diaphragm Backing Plate 1 PRH-391G-8000
13 Diaphragm Backing Plate (with o-ring groove) 1 PRH-392G-8000
14 PM Set of Two Diaphragms 1 DIH-425C-8000
15 PM O-Ring 2 OH-BUN-020
16 Diaphragm Bolt and Diaphragm Bolt Base Assembly 1 PRH-639A-8000-SS
17 Diaphragm Bolt (pre-assembled, press fit with base) 1
18 Diaphragm Bolt Base (316 SS) (with o-ring groove)
(pre-assembled, press fit with bolt) 1
19 A Lower Valve Body (3⁄4") 1 PRH-23077-8000
19 B Lower Valve Body (1") 1 PRH-23077-12000
20 Hex Nut, 3⁄8-16 (Stainless) 6 BTH-STA-145M-SS
21 A * Trim Capsule Assembly (4000 PPD Ammonia) 1 PRH-668-8000-SS
21 B * Trim Capsule Assembly (6000 PPD Ammonia) 1 PRH-668-12000-SS
21 C * Trim Capsule Assembly (8000 PPD Ammonia) 1 PRH-668-16000-SS
22 PM Gasket 1 GAH-334C-8000
23 PM Valve Screen (Hastelloy) 1 PRH-433S-8000-HC
24 A Valve Body Capsule (316SS) (4000 PPD Ammonia) 1 PRH-433A-8000-SS
24 B Valve Body Capsule (316SS)
(6000 PPD & 8000 PPD Ammonia) 1 PRH-433A2-12000-SS
25 Pin (Stainless) 1 PRH-398A-8000-SS
26 A PM Valve Seat (4000 PPD Ammonia) 1 PRH-433F-8000
26 B PM Valve Seat (6000 PPD Ammonina) 1 PRH-433F2-12000
26 C PM Valve Seat (8000 PPD Ammonia) 1 PRH-433F3-16000
27 A Valve Plug (4000 PPD Ammonia) 1 PRH-433C-8000-SS
27 B Valve Plug (6000 PPD Ammonia) 1 PRH-433C2-12000-SS
27 C Valve Plug (8000 PPD Ammonia) 1 PRH-433C3-16000-SS
28 Trim Spring (Hastelloy) 1 SPH-424B-8000-HC
29 A Spring Seat Cap (316SS) (4000 PPD Ammonia) 1 PRH-378D-8000-SS
29 B Spring Seat Cap (316SS)
(6000 PPD & 8000 PPD Ammonia) 1 PRH-378D2-12000-SS
30 PM Lower End Cap Lead Gasket 1 GAH-LED-334
31 Lower End Cap 1 PRH-378L-8000
PM Part & Maintenance Kit (4000 PPD Ammonia) KTH-PRV-71H-NH3-2
PM Part & Maintenance Kit (6000 PPD Ammonia) KTH-PRV-71H-NH3-3
PM Part & Maintenance Kit (8000 PPD Ammonia) KTH-PRV-71H-NH3-4
* Replacement requires new GAH-LED-334
11

25
A
25
B
26 14
15
16
17
23
11
13
22
10
1
2
3
4
5
6
7
8
9
28
29
30
A/B
31
32
A/B/C
33
A/B/C
34
35
36
37
27
A/B/C
20
21
21
18
19
12
24
19
18
20
21
Date: 2019-09-27-v1
EXPLODED VIEW
Dwg. No. PRV-71H-ELE-NH3, EXP
ELECTRONIC PRESSURE REDUCING
AND SHUTOFF VALVE (AMMONIA)
12

Date: 2019-09-27-v1
BILL OF MATERIALS
Dwg. No. PRV-71H-ELE-NH3, BOM
ELECTRONIC PRESSURE REDUCING
AND SHUTOFF VALVE (AMMONIA)
Item Part
No. Description Quantity No.
1 A Actuator (120 V) 1 PRHA-766-120
1 B Actuator (240 V) 1 PRHA-1025-240
2 Stem Nut 1 PRH-142E-000
3 Hex Nut, Actuator 1 BTH-STA-AN
4 Set Screw, 5-40 x 1⁄8", SS 2 BTH-STA-54018
5 Locking Nuts, HCX, 5⁄8-18 2 BTH-STA-5818
6 Valve Ram Stem 1 PRH-433E-000
7 Valve Gland 1 PRH-433G-000
8 PM O-Ring 1 OH-BUN-212
9 PM O-Ring 1 OH-BUN-114
10 Mounting Bracket 1 PRH-353A-8000
11 Hex Head Screw, 3⁄8-16 x 13⁄4" (Stainless) 6 BTH-STA-040F-SS
12 Upper Valve Body, Electronic 1 PRH-23078-12000
13 Seat Cap and Seat Cap Bushing Assembly, Electronic 1
14 Seat Cap, Electronic (pre-assembled with bushing) 1 PRH-640A2-12000
15 Seat Cap Bushing (pre-assembled with cap) 1 PRH-640B-8000
16 Loading Spring 1 SPH-424A-8000
17
3⁄4-16 Brass Hex Nut 1 PRH-397A-8000
18 Diaphragm Backing Plate 1 PRH-391G-8000
19 Diaphragm Backing Plate (with o-ring groove) 1 PRH-392G-8000
20 PM Set of Two Diaphragms 1 DIH-425C-8000
21 PM O-Ring 2 OH-BUN-020
22 Diaphragm Bolt and Diaphragm Bolt Base Assembly 1 PRH-639A-8000-SS
23 Diaphragm Bolt (pre-assembled, press fit with base) 1
24 Diaphragm Bolt Base (316SS) (with o-ring groove)
(pre-assembled with bolt) 1
25 A Lower Valve Body (3⁄4") 1 PRH-23077-8000
25 B Lower Valve Body (1") 1 PRH-23077-12000
26 Hex Nut, 3⁄8-16 (Stainless) 6 BTH-STA-145M-SS
27 A * Trim Capsule Assembly (4000 PPD Ammonia) 1 PRH-668-8000-SS
27 B * Trim Capsule Assembly (6000 PPD Ammonia) 1 PRH-668-12000-SS
27 C * Trim Capsule Assembly (8000 PPD Ammonia) 1 PRH-668-16000-SS
28 PM Gasket 1 GAH-334C-8000
29 PM Valve Screen (Hastelloy) 1 PRH-433S-8000-HC
30 A Valve Body Capsule (316SS) (4000 PPD Ammonia) 1 PRH-433A-8000-SS
30 B Valve Body Capsule (316SS) (6000 PPD & 8000 PPD Ammonia) 1 PRH-433A2-12000-SS
31 Pin (Stainless) 1 PRH-398A-8000-SS
32 A PM Valve Seat (4000 PPD Ammonia) 1 PRH-433F-8000
32 B PM Valve Seat (6000 PPD Ammonia) 1 PRH-433F2-12000
32 C PM Valve Seat (8000 PPD Ammonia) 1 PRH-433F3-16000
33 A Valve Plug (4000 PPD Ammonia) 1 PRH-433C-8000-SS
33 B Valve Plug (6000 PPD Ammonia) 1 PRH-433C2-12000-SS
33 C Valve Plug (8000 PPD Ammonia) 1 PRH-433C3-16000-SS
34 Trim Spring (Hastelloy) 1 SPH-424B-8000-HS
35 A Spring Seat Cap (316SS) (4000 PPD Ammonia) 1 PRH-378D-8000
35 B Spring Seat Cap (316SS) (6000 PPD & 8000 PPD Ammonia) 1 PRH-378D2-12000
36 PM Lower End Cap Lead Gasket 1 GAH-LED-334
37 Lower End Cap 1 PRH-378L-8000
PM Part & Maintenance Kit (4000 PPD Ammonia) KTH-PRV-71H-NH3-2
PM Part & Maintenance Kit (6000 PPD Ammonia) KTH-PRV-71H-NH3-3
PM Part & Maintenance Kit (8000 PPD Ammonia) KTH-PRV-71H-NH3-4
* Replacement requires new GAH-LED-334
13

778 " 199
5716 " 139
3/4" FNPT
Inlet
5" 127
614 " 159
316
" 5
312 " 89
212
" 64
778
" 199
12
" 13
21316
" 71
21316
" 71
1" 25
(4 PLACES)
38
" 10
(4 PLACES)
234 " 69
3/4" or 1"
FNPT
Outlet
1/4" FNPT
Vent
connection
3/4" or 1"
FNPT
Outlet
1/4" FNPT
Vent connection
Date: October 2015
DIMENSIONAL DRAWING
Dwg. No. PRV-71H, DIM
PRESSURE REDUCING
AND SHUTOFF VALVE
14

151
4
" 388
83
16
" 208
315
16
" 100 41
4
" 108
3/4" FNPT
Inlet
61
4
" 159
5" 127
3
16
" 5
31
2
" 89
21
2
" 64
1/4" FNPT
Vent connection
213
16
" 71
1
2
" 13
77
8
" 199
213
16
" 71
3
8
" 10
(4 PLACES)
1" 25
(4 PLACES)
23
4
" 69
3/4" or 1"
FNPT
Outlet
3/4" or 1"
FNPT
Outlet
1/4" FNPT
Vent
connection
Date: 2019-09-16-v1
DIMENSIONAL DRAWING
Dwg. No. PRV-71H-ELE, DIM
ELECTRONIC PRESSURE REDUCING
AND SHUTOFF VALVE
15

GROUND
NEUTRAL
LINE
LINE
NEUTRAL
GROUND
Common
Normally
Normally
Closed
Open
GROUND
NEUTRAL
LINE
COM.
N.O.
N.C.
Date: 2019-09-16-v1
Dwg. No. PRV-PCB-1
PRV-71H-ELE
CIRCUIT BOARD
16

PRV-71H
WITH HEATER
HEATER
POWER
CORD
THERMOSTAT
HEATER
POWER
CORD
THERMOSTAT
PRV-71H-ELE
WITH HEATER
GREEN LED
INDICATOR
FRONT FLAT PATTERN VIEW
BACK FLAT PATTERN VIEW
HEATER
POWER
CORD
THERMOSTAT
HOOK AND LOOP
FASTENERS
Date: 2019-09-16-v1
HEATER for PRV-71H
and PRV-71H-ELE
17