VSZVMZMVA - Fan Coil Unit Valves and Actuators

This range of control valves can be used in air conditioning systems to control the flow of chilled and heating water. The valves are screwed and available in sizes from 15mm to 25mm with Kv values of 2.5 thru 6. The actuators are available in 24 and 240 volt.

Valve
Type 2 way VSZ*
3 way VMZ*
Part number see dimensional table
Size 15mm, 20mm, 25mm
Construction linear plug
Characteristics linear
Kv value 2.5 - 6.0
Pressure rating 16 bar
Temperature range from 5°C to 95°C
Material
body
Brass OT58
seat
rubber
stem
CrNi steel
stem packing Double O ring in Buna N

Actuator
Voltage MVA21 110 - 240 vac
MVA41 24 vac
cold start time 180 seconds
max stroke 3.5mm
Temperature range from 5°C to 50°C

PD =(1/(kv/ (flow x3.6))2)x100
where PD = kPa
flow = I/s

The MVA actuators are electro-thermal type. When power is applied to the actuator, a small PTC thermistor is used to heat the thermostatic element causing a small piston to come out and lower the valve stem. With a suitable PWM signal the actuator can modulate the valve, normally the actuator is a 2 position type.