Description
The Maplef Green is a series of pressure independent control valves that are two way, modulating to accept digital or analog input signals. The valves accept 0(2)-10V, 3-point floating or ON/OFF input signals provided by the same actuator. Each valve has an adjustable maximum flow rate setting maintaining a full stroke to enable flow limitationand balancing to the coil or zone that the valve is controlling.
For use in fan-coil units, air-handling units, VAV applications and cooling ceilings for activation of heating or cooling.
Features
FEATURES / CHARACTERSTICS
Static pressure : 2500 kPa / 360 psi
Ambient temperature : +1ºC to +50ºC / +34ºF to +122ºF
Media temperature1 : -20ºC to +120ºC / -4ºF to +248ºF
Material:
Housing and covers : Forged brass ASTM CuZn40Pb2 or Ductile iron
ASTM A395 Grade 60-40-18
Composite components (internal) : Glass-reinforced PSU/PPS/POM
Metal components (internal) : Stainless steel
O-rings and seats : EPDM
Diaphragm : Hydrogenated acrylonitrile-butadiene-rubber
Stroke : 6.2 mm / 0.24 in
Maximum close off pressure : 800 kPaD / 116 psid
Maximum operational ΔP : 600 kPaD / 87 psid
Control characteristic : linear (may be converted to equal % on actuator)
Control range : 1:1000 / IEC 60534
Rangeability : 100:1
Turn down ratio : 100:1
Shut-off leakage : ANSI/FCI 70-2 2006, Class IV / IEC 60534-4, Class IV
Flow rate range : 0.528-3.79 l/sec / 8.36-60.0 GPM
End connections2 : ISO or NPT
Specification
1.1. Contractor shall install the pressure independent dynamic control valves where indicated in drawings.
1.2. Valve shall be an electronic, dynamic, modulating, 2-way, pressure independent control device.
1.3. Pressure independent dynamic control valve shall accurately control flow, independent of system pressure fluctuation.
1.4. Maximum flow setting shall be adjustable to 41 different settings within the range of the valve size.
1.5. Valve housing shall be permanently marked to show direction of flow.
2. VALVE ACTUATOR – MAPLEF MFH
2.1. Actuator housing shall be rated to IP54. 360º mouting shall be acceptable.
2.2. Actuator shall be driven by 24V AC/DC and accept 0(2)-10V DC, 3-point floating or 2-position control signal.
2.3. Actuator shall use full stroke and provide full authority.
2.4. Actuator shall have visible indication of stroke position.
2.5. Feedback signal equal to control signal shall be standard on 24V versions.
2.6. Failsafe version shall be available.
2.7. Auto stroke function shall be available.
2.8. Override shall be possible.
3. VALVE HOUSING – MAPLEF GREEN.3
3.1. Valve housing DN40-DN50 (1 1/2”-2”) female-female shall consist of
forged brass ASTM CuZn40Pb2 or Ductile iron ASTM A395 Grade 60-40-18,
rated at no less than 2500 kPa (360 psi) static pressure a +120ºC (+248ºF).
3.2. Pressure/temperature test plugs for verifying accuracy of flow
performance shall be availble for all valve sizes.
4. FLOW REGULATION UNIT
4.1. Flow regulation unit shall consist of glass-reinforced PPS, PSU and POM with HNBR diaphragm and EPDM sealings.
4.2. Flow regulation unit shall be externally adjustable to 1 of 41 different flow rates without limiting the stroke length; minimum range shall be capable of being activated by minimum 16 kPaD (2.3 psid) and shall be capable of controlling the flow within ±10% of controlled flow or ±5% of maximum flow.
