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Waterworks

Building and Industry

Bermad Model 720 - Pressure Reducing Valve

The Model 720 Pressure Reducing Valve is a hydraulically operated, diaphragm actuated control valve that reduces higher upstream pressure to lower constant downstream pressure regardless of fluctuating demand or varying upstream pressure.

PRODUCT CODE:
720-XXX
SIZE RANGE:
40-1200mm

Features and Benefits

  • Designed to – stand up to the toughest conditions
    - Excellent anti-cavitation properties
    - Silent operation suitable for urban and high
    - Wide flow range
    - High stability and accuracy
  • Double chamber design
    - Moderated valve reaction
    - Protected diaphragm
  • Flexible design – Easy addition of features
  • Obstacle free, full bore – Free flow pass
  • V-Port Throttling Plug – Very stable at low flow
  • Complies with EN-1074 standards
    - High quality materials
    - Stainless steel trim components
  • In-line serviceable – Easy maintenance

Major Additional Features

  • Pressure management valve – 7PM
  • Solenoid control – 720-55
  • Check valve – 720-20
  • Solenoid control & check valve – 720-25
  • Proportional – 720-PD
  • High sensitivity pilot – 720-12
  • Downstream over pressure guard – 720-48
  • Electrically selected multi-level setting – 720-45
  • Electronic multi-level setting, Type 4T –720-4T
  • Electronic pressure reducing valve – 728-03

Operation

Bermad Model 720 - Pressure Reducing Valve - Operation

The Model 720 is a pilot controlled valve equipped with an adjustable, 2-way pressure reducing pilot.
The restriction [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 V-Port plug (optional) [4] increases the ratio of flow to stem travel, providing more accurate, stable and smooth regulation. The integral orifice between the lower control chamber and valve outlet moderates valve reactions. The one-way flow control needle valve [5] stabilizes the valve’s reaction in hard regulation conditions, by restricting the flow out of the control chamber.
The downstream cock valve [6] enables manual closing.

Pilot system Specifications

Standard Materials:

Pilot:

Body: Stainless Steel 316 or Bronze

Elastomers: Synthetic Rubber

Spring: Galvanized Steel or Stainless Steel

Tubing & Fittings: Stainless Steel 316 or Copper & Brass

Accessories: Stainless Steel 316, Brass and Synthetic Rubber Elastomers

Pilot Adjustment Range:

0.5 to 3.0 bar ; 7 to 40 psi

0.8 to 6.5 bar ; 11 to 95 psi

1 to 16 bar ; 15 to 230 psi

5 to 25 bar ; 70 to 360 psi

Notes:

  • Inlet pressure, outlet pressure and flow rate are required for optimal sizing and cavitation analysis
  • Recommended continuous flow velocity: 0.1-6.0 m/sec ; 0.3-20 ft/sec
  • Minimum operating pressure: 0.7 bar ; 10 psi. For lower pressure requirements consult factory.

Cavitation Chart

Bermad Model 720 - Pressure Reducing Valve - Cavitation Chart

Pressure Management

A well-planned pressure management program can significantly reduce not only volumes of real loss, but also maintenance costs by reducing occurrence of bursts and thereby extending the life of the system.

Common PRV Model 720

Common PRV Model 720

Common PRVs are set to maintain a constant low downstream pressure, ensuring sufficient pressure at the system’s critical point during peak demand (when line friction head loss is highest). The shaded area represents the hours and levels when pressure is higher than required.

Dynamic PRV Model 720-4T

Dynamic PRV Model 720 - 4T

The dynamic PRV - Model 720-4T, integrated with a PR controller, is designed to continuously correct its set value based on the momentary demand and/or minimum required pressure at the system critical point. As a result, the average network pressure dramatically decreases, reducing system leakage, bursts, maintenance, and energy costs. The shaded area represents the hours and levels of reduced leakage.

Flow Function Control

Data logging and analysis of the distribution network parameter values, enable establishment of a function for real time adjustment of pressure per system demand. The flow and pressure transducers continuously transmit to the controller, which reacts by adjusting the Model 720-4T according to the pre-established function. The controller’s program can be changed either through a laptop computer or a pocket PC, SMS, or any other communication method available.

Time Function Control

The PRV model 720-45 integrated with the BE-PRV-DL controller is designed to maintain two pressure reducing set-point values. The BE-PRV-DL controller is programmed to switch between the two pilot valves and therefore change the pressure reducing set-point. The BE-PRV-DL control program can adapt to special days, or seasons of the year, as well as log pressure and flow data.

Pressure-Reducing Systems in Hi-Rise Buildings

Water supply system design requirements for hi-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 hi-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 Valve together with BERMAD’S accumulated experience, address these issues and provide appropriate solutions.

A Higher zone pressure reducing system installation
B Lower zone pressure reducing system(two-stage) installation
C Bottom reservoir level control system
D Roof reservoir level control system
E Potable water pumping system
F Fire protection pumping system
G Upper floors pumping system

Higher-Zone Installation A

In addition to the standard pressure reducing system, for a hi-rise building, BERMAD recommends the system also include Pressure Switches to signal a control panel of excessive downstream pressure.

[1] Strainer Model 70F
[2] Pressure Reducing Valve Model 720
[3] By-pass Pressure Reducing Valve Model 720
[4] Relief Valve Model 73Q
[5] Proportional Pressure Reducing Valve Model 720-PD
[6]By-Pass Proportional Pressure Reducing Valve Model 720-PD
[7] Pressure Switch

Lower Zone (Two-Stage) Installation B

When dealing with high differential pressure systems in lower zones of a hi-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, as the first pressure reducing stage, absorbs part of the high differential pressure. By spreading the load of pressure reduction on to two components, cavitation damage and noise are reduced.

[1] Strainer Model 70F
[2] Pressure Reducing Valve Model 720
[3] By-pass Pressure Reducing Valve Model 720
[4] Relief Valve Model 73Q
[5] Proportional Pressure Reducing Valve Model 720-PD
[6]By-Pass Proportional Pressure Reducing Valve Model 720- D
[7] Pressure Switch

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.

Pressure Reducing System – Typical Installations

Standard Pressure Reducing System A

In addition to the Model 720 Pressure Reducing Valve, BERMAD recommends that the system also include:

  • Strainer Model 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 bypass valve cuts operating hours of the larger valve, achieving greater return on investment.

High Differential Pressure Reducing Systems B

First stage reduction is achieved by using the proportional pressure reducing valve model 720-PD. This reduces cavitation damage and noise level by distributing the load of the high differential pressure.

Technical Data

Size Range: DN40-900 ; 11/2–36”

End Connections (Pressure Ratings):

Flanged: ISO PN16, PN25 (ANSI Class 150, 300)

Threaded: BSP or NPT

Others: Available on request

Valve Patterns: “Y” (globe) & angle, globe (DN600-900 ; 24”-36”)

Working Temperature: Water up to 80°C ; 180°F

Standard Materials:

Body & Actuator: Ductile Iron

Internals: Stainless Steel, Bronze & coated Steel

Diaphragm: Synthetic Rubber Nylon fabric-reinforced

Seals: Synthetic Rubber

Coating: Fusion Bonded Epoxy, RAL 5005 (Blue) approved for drinking water or Electrostatic Polyester Powder

Differential Pressure Calculation

How to Order

Please specify the requested valve in the following sequence: (for more options please contact us)

  • Size
  • Main model
  • Additional features
  • Pattern
  • Body material
  • End connection
  • Coating
  • Voltage & main valve position
  • Tubing & Fittings materials
  • Operational data (according to model)
  • Pressure data
  • Flow data
  • Reservoir level data
  • Settings

Manual
Datasheet
Engineering Data*
* Note: For some products Manual or Engineering Data are available only upon request.

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Product code

Bermad Model 720 - Pressure Reducing Valve

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