Bermad - Model 700 - Sigma EN/ES - Engineering Data

Valve Patterns: “Y” (Globe)

Pressure Rating: 16 bar - with higher pressure options available.

End Connections:

EN: 50-400mm - Flanged

ES: 65-600mm - Flanged

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

Temperature Rating: 60°C, 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, contact Deeco.

Dimensions and Weights - 700 Sigma EN

Flow Factors - 700 Sigma EN

Flow Chart - 700 Sigma EN

Technical Data - 700 Sigma ES

Valve Patterns: “Y” (Globe)

Pressure Rating: 16 bar - with higher pressure options available.

End Connections: 65-300mm - Flanged

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

Temperature Rating: 60°C, 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, contact Deeco.

Dimensions and Weights - 700 Sigma ES

Flow Factors - 700 Sigma ES

Flow Chart - 700 Sigma ES

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

When the fluid’s static pressure reaches liquid vapour pressure, vapour cavities (bubbles) form and grows 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 charts below should be considered only as a general guide
3. For optimum system and control valve application, please consult Deeco.

Single Cavitation Cage - C1

Double Cavitation Cage - C2

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 a very wide flow range with relatively high-pressure reduction and providing a 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 changed before or after valve installation on-site.

Valve Plug Characteristics

Independent Lift Check - 2S

The BERMAD Independent Lift Check feature is an integral, lift-type, spring-loaded non-return trim that allows 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 backup safety feature is a Triple Chamber actuated valve, where the third control chamber enables a failsafe 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 an accurate flow measurement function.

Valve Position Indicator - I

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

Single Limit Switch - S

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

Double Limit Switch - SS

The BERMAD Double Limit Switch Assembly includes two mechanical and electrical switches, enabling remote signalling 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 signalling of the valve’s relative position.