BERMAD 720 User manual

BERMAD Waterworks
Pressure Reducing
Valve
700 Series
Model 720
The Model 720 Pressure Reducing Valve is a hydraulically
operated, diaphragm actuated control valve that reduces
higher upstream pressure to lower constant downstream
$$$%;
upstream pressure.
Flow and leakage reduction
Cavitation damage protection
Throttling noise reduction
Burst protection
System maintenance savings
Features and Benefits
Line pressure driven – Independent operation
In-line serviceable – Easy maintenance
Double chamber design
Moderated valve reaction
Protected diaphragm
Flexible design – Easy addition of features
Variety of accessories – Perfect mission matching
"Y" or angle, wide body –}%'$
 –$$N
Stainless Steel raised seat – Cavitation damage resistant
Obstacle free, full bore – Uncompromising reliability
V-Port Throttling Plug –`NN;
Major Additional Features
(``– FP-720-UL
Solenoid control – 720-55
Check valve – 720-20
9"– 720-25
Proportional – 720-PD
Automatic regulation override – 720-09
High sensitivity pilot – 720-12
Emergency pressure reducing valve – 720-PD-59
Downstream over pressure guard – 720-48
Electrically selected multi-level setting – 720-45
=%$6;K6– 720-4T
Electronic pressure reducing valve – 728-03
See relevant BERMAD publications.

BERMAD Waterworks
700 Series
Model 720
Engineer Specifications
The Pressure Reducing Valve shall reduce higher upstream pressure to lower preset downstream pressure regardless of
fluctuating demand or varying upstream pressure.
Main Valve: The main valve shall be a center guided, diaphragm actuated globe valve of either oblique (Y) or angle pattern
design. The body shall have a replaceable, raised, stainless steel seat ring. The valve shall have an unobstructed flow path,
with no stem guides, bearings, or supporting ribs. The body and cover shall be ductile iron. All external bolts, nuts, and studs
shall be Duplex® coated. All valve components shall be accessible and serviceable without removing the valve from the pipeline.
Actuator: The actuator assembly shall be double chambered with an inherent separating partition between the lower surface
of the diaphragm and the main valve. The entire actuator assembly (seal disk to top cover) shall be removable from the valve
as an integral unit. The stainless steel valve shaft shall be center guided by a bearing in the separating partition. The replaceable
radial seal disk shall include a resilient seal and shall be capable of accepting a V-Port Throttling Plug by bolting.
Control System: The control system shall consist of a 2-Way adjustable, direct acting, pressure reducing pilot valve, a needle
valve, isolating cock valves, and a filter. All fittings shall be forged brass or stainless steel. The assembled valve shall be
hydraulically tested and factory adjusted to customer requirements.
Quality Assurance: The valve manufacturer shall be certified according to the ISO 9001 Quality Assurance Standard. The main
valve shall be certified as a complete drinking water valve according to NSF, WRAS, and other recognized standards.
Operation
The Model 720 is a pilot controlled valve equipped with an adjustable, 2-Way pressure reducing pilot.
The needle valve [1] continuously allows flow from the valve inlet into the upper control chamber [2]. The pilot [3] senses
downstream pressure.
Should this pressure rise above pilot setting, the pilot throttles, enabling pressure in the upper control chamber to accumulate,
causing the main valve to throttle closed, decreasing downstream pressure to pilot setting.
Should downstream pressure fall below pilot setting, the pilot releases accumulated pressure, and the main valve
modulates open.
The integral orifice between the lower control chamber and valve outlet moderates valve reactions.
The needle valve controls the closing speed. The downstream cock valve [4] enables manual closing.
11/2-10”
with #2PB Pilot
6-14”
with #2 Pilot
➊
[3]
[2]
[1]
[3]
[2]
[1]
[4] [4]
Note: For 16" and larger valves,
see "Pilot Valve Selection" table at the last page.

BERMAD Waterworks
700 Series
Model 720
Typical Applications
Pressure Reducing System for Municipal Networks
Network design requires establishing various pressure zones due to topography, distances, demands, energy costs,
reservoir availability, etc.
The pump supplies water to the network and to the reservoir. System pressure is too high for the residential
neighborhood, requiring a pressure reducing system.
In addition to the Model 720 Pressure Reducing Valve, BERMAD recommends that the system also include:
■StrainerModel 70F prevents debris from damaging valve operation
■Relief Valve Model 73Q provides:
❏Protection against momentary pressure peaks
❏Visual indication of need for maintenance
■By-Pass Pressure Reducing Valve saves on maintenance costs. The larger (more costly to maintain) valve operates
during peak demand. The smaller by-pass valve cuts operating hours of the larger valve, achieving greater
return on investment.
For high differential pressure systems, see BERMAD publication 720-PD Proportional Pressure Reducing Valve.
For high pressure systems, see BERMAD publication 820 Piston Actuated Pressure Reducing Valve.
Strainer
Model 70F
By-Pass
Pressure Reducing Valve
Model 720
Pressure Reducing Valve
Model 720
Relief Valve
Model 73Q
Pressure Reducing System – Typical Installation

BERMAD Waterworks
700 Series
Model 720
Pressure Reducing Systems in High-Rise Buildings
Water supply system design requirements for high-rise
buildings present unique issues:
■Supply cut-off is unacceptable and single source supply
is common.
■Valves are located in areas where water damage can
be extremely expensive.
■Pressure reducing systems are often located next to
prestigious residential and office space. Extraneous
noise and maintenance activities are to be avoided.
■The main supply line of high-rise buildings is exposed
to greater head at lower zones while pressure for the
consumer must be kept within recommended levels.
As a result, lower zone pressure reducing systems deal
with greater differential pressure.
The Model 720 Pressure Reducing Valves together
with BERMAD’S accumulated experience address these
issues and provide appropriate solutions.
AHigher zone pressure reducing system installation
BLower zone pressure reducing system
(two-stage) installation
CBottom reservoir level control system
DRoof reservoir level control system
EPotable water pumping system
FFire protection pumping system
GUpper floors pumping system
F
CE
G
A
A
B
B
A
D
G
D
E F
C
F
CE
B
E F
C

BERMAD Waterworks
700 Series
Model 720
For high differential pressure systems, see BERMAD publication 720-PD Proportional Pressure Reducing Valve.
For high pressure systems, see BERMAD publication 820 Piston Actuated Pressure Reducing Valve.
Higher Zone Installation A
In addition to the municipal pressure reducing system for a high-rise building, BERMAD recommends the
system also include:
■Parallel Redundant Branches ensuring uninterrupted supply by enabling unskilled personnel to temporarily
shut off one of the branches.
■Emergency System including a downstream pressure switch and an Emergency Valve Model 720-PD-59.
❏Pressure Switch [6] signals a control panel of excessive downstream pressure.
❏Emergency Valve [2] is fully open during normal operation. Triggered by the control panel, it becomes a
proportional pressure reducing valve.
[1] Strainer Model 70F
[2] Emergency Pressure Reducing
Valve Model 720-PD-59
[3] Proportional Pressure Reducing
Valve Model 720-PD
[4] By-Pass Proportional Pressure
Reducing Valve Model 720-PD
[5] Primary Relief Valve Model 73Q
[6] By-Pass Relief Valve Model 73Q
[7] Pressure Reducing Valve
Model 720
[8] By-Pass Pressure Reducing
Valve Model 720
[9] Relief Valve Model 73Q
[10] Pressure Switch
[1] Strainer Model 70F
[2] Emergency Pressure Reducing
Valve Model 720-PD-59
[3] Pressure Reducing Valve
Model 720
[4] By-pass Pressure Reducing
Valve Model 720
[5] Relief Valve Model 73Q
[6] Pressure Switch
Control Panel
[1]
[2] [3] [5]
[6]
[4]
[5]
[3]
[3]
[4]
[7]
[7]
Control Panel
[1]
[2] [5]
[6] [8]
[9]
[9]
[3] [5]
[10]
Lower Zone (Two-Stage) Installation B
When dealing with high differential pressure systems in lower zones of a high-rise building, BERMAD recommends a
two-stage pressure reducing system. In addition to the typical higher zone installation, this high differential pressure
system also includes:
■Proportional Pressure Reducing Valve Model 720-PD, as the first pressure reducing stage, absorbs part of the
high differential pressure. By spreading the load of pressure reducing onto two components, cavitation damage and
noise are reduced.

The information herein is subject to change without notice. BERMAD shall not be held liable for
any errors. All rights reserved. © Copyright by BERMAD.
PC7WE20 05
[email protected] • www.bermad.com
Technical Data
Dimensions and Weights
Data is for Y-pattern, flanged, PN16 valves
Weight is for PN16 basic valves
“C” enables removing the actuator in one unit
“L”, ISO standard lengths available
For more dimensions and weights tables, refer to Engineering Section
BERMAD Waterworks
700 Series
Model 720
------
Waterworks Epoxy FB Blue EB
Polyester Green PG
Polyester Blue PB
Uncoated UC
Use when additional electric control
feature is selected
Additonal
Attributes
VI
Tubing
& Fittings
CB
Voltage &
Position
–
Coating
EB
End
Connections
16
Body
Material
C
Pattern
Y
Additional
Feature
00
Sector
WW
Ductile Iron Standard C
Cast Steel S
St. Steel 316 N
Nickel Alumin. Bronze U
ISO-16 16
ISO-25 25
ANSI-150 A5
ANSI-300 A3
JIS-16 J6
JIS-20 J2
Valve Position Indicator I
V-Port Throttling Plug V
Large Control Filter F
Electric Limit Switch S
3-Way Control Loop X
Valve Position Transmitter Q
St. St. 316 Control Accessories N
St. St. 316 Internal Trim (Closure & Seat) T
St. St. 316 Actuator Internal Assembly D
Delrin Bearing R
Viton Elastomers for Seals & Diaphragm E
Pressure Gauge 6
Oblique (up to 20”) Y
Angle (up to 18”) A
Globe (24-32” only) G
How to Order
Please specify the requested valve in the following sequence: (for more options, refer to Ordering Guide)
Primary
Feature
720
Pressure Reducing11/2- 32”
Size
6”
Main Valve
Valve Patterns: “Y” (globe) & angle
Size Range: 11/2–32” (40-800 mm)
End Connections (Pressure Ratings):
Flanged: ISO PN16, PN25
(ANSI Class 150, 300)
Threaded: BSP or NPT
Others: Available on request
Working Temperature:
Water up to 80°C (180°F)
Standard Materials:
Body & Actuator: Ductile Iron
Internals:
Stainless Steel, Bronze & coated Steel
Diaphragm:
NBR Nylon fabric-reinforced
Seals: NBR
Coating:
Fusion Bonded Epoxy, RAL 5005 (Blue)
NSF & WRAS approved or Electrostatic
Polyester Powder, RAL 6017 (Green)
10 100 1,000 10,000
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1
2
3
4
5
6
7
8
9
10
100 1,000 10,000
Flow Rate - m
3
/h
Pressure Loss - bar Pressure Loss - psi
Flow Rate - gpm
1.5"
2"
2.5"
3"
4"
6"
8"
10"
12"
14"
16"
18"
20"
28"
50 500 5,000
50 500 5,000
30"
32"
24”
Flow Chart
Data is for Y-pattern, flat disk valves
For more flow charts, refer to Engineering Section
No Additional Feature 00
Closing and Opening Speed Control 03
Automatic Regulation Override 09
High sensitivity pilot 12
Check Valve 20
Solenoid Controlled & Check Valve 25
Multi-Setting Levels - Electrically Selected 45
Downstream Over Pressure Guard 48
Hydraulic Control 50
Solenoid Controlled 55
Electric Override 59
Copper Tubing & Brass Fittings CB
Plastic Tubing & Brass Fittings PB
St. St. 316 Tubing & Fittings NN
24VAC/50Hz - N.C. 4AC
24VAC/50Hz - N.O. 4AO
24VDC - N.C. 4DC
24VDC - N.O. 4DO
24VDC - L.P. 4DP
220VAC/50-60Hz N.C. 2AC
220VAC/50-60Hz N.O. 2AO
Multiple choices permitted Multiple choices permitted
Size A, B C L H Weight
mm
40
50
65
80
100
150
200
250
300
350
400
450
500
inch
11/2”
2
21/2”
3”
4”
6”
8”
10”
12”
14”
16”
18”
20”
mm
350
350
350
370
395
430
475
520
545
545
645
645
645
inch
14
14
14
15
16
17
19
21
22
22
26
26
26
mm
180
180
180
230
275
385
460
580
685
685
965
965
965
inch
7
7
7
9
11
15
18
23
27
27
38
38
38
mm
205
210
222
250
320
415
500
605
725
733
990
1000
1100
inch
8.1
8.3
8.7
9.8
12.6
16.3
19.7
23.8
28.5
28.9
39.0
39.4
43.3
mm
239
244
257
305
366
492
584
724
840
866
1108
1127
1167
inch
9.4
9.6
10.1
12.0
14.4
19.4
23.0
28.5
33.1
34.1
43.6
44.4
45.9
kg
9.1
10.6
13
22
37
75
125
217
370
381
846
945
962
lbs
20
23
29
49
82
165
276
478
816
840
1865
2083
2121
H
L
C
A
B
Control System
Standard Materials:
Accessories:
Bronze, Brass, Stainless Steel & NBR
Tubing: Copper or Stainless Steel
Fittings: Forged Brass or Stainless Steel
Pilot Standard Materials:
Body: Brass, Bronze or Stainless Steel
Elastomers: NBR
Springs: Galvanized Steel or Stainless Steel
Internals: Stainless Steel
Pilot Valve Selection
#2HC#2
Pilot Type
Valve Size Pilot
Setting (bar)
Standard model with high pressure setting kit
11/2-10”
40-250 mm
6-14”
150-350 mm
16 -32”
400-800 mm
<15
>15
<15
>15
<15
>15
#2PB