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Bermad Model 700 - Sigma EN/ES - General Information

BERMAD 700 SIGMA EN/ES series are hydraulically operated, oblique pattern control valves with high cavitation resistance, excellent flow capacity and double chamber unitized actuator, that can be disassembled from the body as a separate integral unit. The valves hydrodynamic body is designed for unobstructed flow path and provides an excellent and highly effective modulation capacity for high differential pressure applications, with minimal noise and vibrations. The 700 SIGMA EN/ES series meet all flange connection standards. 700 SIGMA EN – Full port valve with extraordinarily high flow capacity enabling optimized used of resources and minimizing energy costs. 700 SIGMA ES - Designed mainly for regulating applications achieving the best performance under variable flow velocities in pipes

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

Features and Options

  • Dֺֺouble-Chambered Actuator
    - Actuator assembly can be removed as one integral unit.
    - Simple on-site conversion from Single to Double chambered actuator or vice versa.
  • Wֺֺide Body-Oblique “Y” pattern design
    - Hydro-dynamically designed for efficient flow with minimal pressure loss and excellent resistance to cavitation. Valve port area clear of obstructions; no ribs or stem guides. Increases capacity by 25% over standard globe valves.
  • Dֺֺiaphragm Assembly
    - The flexible, flat fabric reinforced diaphragm is supported over the majority of its surface.
    - Diaphragm load is limited to only the stretching forces applied to the active area.
    - Diaphragm is fully protected by the separtation partition from stones, wood and debris.
  • Vֺֺalves are suitable to work with all types of command: Hydraulic, Electric and Pneumatic.
  • Sֺֺelf operated valves that can work without an external source of power.
  • Wֺֺide range of options:
    - One-way or two-way flow direction
    - V-Port
    - Cavitation cages (Single or Double)
    - Visual position indicator
    - Limit switches
    - Analog opening output
    - Large selection of control accessories

Exploded View

Material Specifications

Principle of Operation

On-Off Modes

3-Way Modulating Mode - Pressure Reducing

2-Way Modulating Mode - Pressure Reducing

Plug Options

BERMAD’s 700 SIGMA EN/ ES series has various plug options to enable different valve characteristics.

Flat plug - standard plug for on-off and high flow applications.

V-Port plug - uniquely designed throttling plug. It changes the ratio of flow to stem travel allowing very wide flow range with relatively high pressure reduction and provides more accurate, stable and smoother response during pressure and flow regulation, while reducing noise and vibration.

BERMAD’s 700 SIGMA EN/ ES series plugs can easily be change before or after valve installation on site.

Valve Plugs Characteristics

Cavitation

The cavitation phenomenon has a significant affect on control valve and system performance.

When the fluid’s static pressure reaches liquid vapor pressure, vapor cavities (bubbles) form and grow until they violently implode by the recovered pressure downstream to the valve seat.

The implosion of these cavities generates high-pressure surges, micro jets and intensive heat, which erode valve components and downstream piping. In its final stage, cavitation flashes and chokes the flow.

The Cavitation Guide is based on the formula commonly used in the valve industry:

σ= (P2-Pv) / (P1-P2)

Where:

σ= Sigma, cavitation index, dimensionless

P1 = Upstream pressure, absolute

P2 = Downstream pressure, absolute

Pv = Liquid vapor pressure, absolute

(Water, 18°C = 0.02 bar-a ; 65°F = 0.3 psi-a)

Notes:

1. An alternate cavitation index formula introduced by

ISA is:

σISA = (P1-Pv) / (P1-P2) which equals σ+1

2. The below charts should be considered only as a general guide.

3. For optimum system and control valve application please contact us.

Cavitation Charts

Cavitation Cage

Single Cavitation Cage - C1

The BERMAD Single Cavitation Cage trim is designed to reduce cavitation, noise and vibration under higher differential pressure operation, as well as smart pressure reducing.

Single Cavitation Cage - C1

Double Cavitation Cage - C2

The BERMAD Double Cavitation Cage trim is designed to resist cavitation, cavitation damage, noise and vibration under extreme differential pressure operation, as well as smart pressure reducing.

Double Cavitation Cage - C2

Valve Cage Characteristics

700 SIGMA EN

Technical Data

Valve Patterns: “Y” (Globe)

Pressure Rating: 25 bar; 400 psi

End Connections: Flanged (all standards)

Plug Types: Flat disc, V-port , Cavitation cages

Temperature Rating: 60°C; 140°F for Cold water applications.

Optional higher temperature: Available on request

Standard Materials:

Body & actuator: Ductile Iron

Bolts, nuts & studs: Stainless Steel

Internals: Stainless Steel, Bronze & Coated Steel

Diaphragm: Fabric-reinforced synthetic rubber

Seals: Synthetic rubber

Coating: Dark blue Fusion bonded epoxy

For other materials please contact us.

Dimensions and Weights

Flow Factors

Flow Chart

* Charts represents fully open valves. Please contact us for proper valve sizing.

Differential Pressure & Flow Calculation

700 SIGMA ES

Technical Data

Valve Patterns: “Y” (Globe)

Pressure Rating: 25 bar; 400 psi

End Connections: Flanged (all standard)

Plug Types: Flat disc, V-port, Cavitation cages

Temperature Rating: 60°C; 140°F for Cold water applications.

Optional higher temperature: Available on request

Standard Materials:

Body & actuator: Ductile Iron

Bolts, nuts & studs: Stainless Steel

Internals: Stainless Steel, Tin Bronze & Coated Steel

Diaphragm: Fabric-reinforced synthetic rubber

Seals: Synthetic rubber

Coating: Dark blue Fusion bonded epoxy

For other materials please contact us.

Dimensions and Weight

Flow Factors

Flow Chart

Differential Pressure & Flow Calculation

700 SIGMA EN/ES - Additional Valve Options and Features

Independent Lift Check - 2S

The BERMAD Independent Lift Check feature is an integral, lift type, spring loaded non return trim that allow full control and regulation in the required direction and smoothly closes drip tight before flow changes direction, regardless of control status.

Back-up Safety - TC

The BERMAD Back-up Safety feature is a Triple Chamber actuated valve, where the third control chamber enables a fail safe mechanism and is recommended in critical or sensitive water systems to ensure continuous operation of the system.

Insertion Flow Meter - MT

The BERMAD Insertion Flow Meter can be inserted into the upstream side of the 700-Sigma EN/ES valves, adding accurate flow measurement function.

Valve Position Indicator - I

The BERMAD Valve Position Indicator Assembly provides a visual indication of valve opening and regulation behavior.

Single Limit Switch - S

The BERMAD Single Limit Switch Assembly includes mechanical electrical change over contacts (NO + NC), enabling remote signaling of the closed valve position.

Double Limit Switch - SS

The BERMAD Double Limit Switch Assembly includes two mechanical electrical switches, enabling remote signaling of the closed and the open valve positions.

Flow Stem - M

The BERMAD Flow Stem Assembly enables limiting the opening stroke of the control valve or for safety ensured mechanical closure.

Lifting Spring - L

The BERMAD Lifting Spring Assembly enables the valve to remain open at zero pressure conditions and to minimize pressure losses.

Analog Valve Position Transmitter - Q

The BERMAD Analog Valve Position Transmitter Assembly enables remote signaling of the valve’s relative position.

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

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Bermad Model 700 - Sigma EN/ES - General Information

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