Brochure

5
Pressure Independent Control Valve (PICV)
Flow limiter = the maximum flow allowed through the valve is determined by the
flow limiter, and is preset to order in the factory, but is easily adjustable in the
field by hand. The flow limiter is independent of the stroke of the valve, thus
maintaining full stroke and full controllability regardless of the maximum
flow setting.
Control valve = is composed of a plug, stem and seat. It’s used to adjust the
flow through the valve based on the load or demand.
Automatic pressure regulator = makes the PICV pressure independent.
It dynamically adjusts an orifice in response to pressure changes to maintain
the desired demand.
Valve components
Zone Valve
Stem = connects the valve actuator to the valve plug.
Bonnet = contains the packing, and attaches the valve to the actuator.
Plug = varies the area of flow through the valve body.
Seat = provides a surface for the plug to seal and stop the flow.
Magnetic Valve
Magnetic valves have two components, the actuator and the valve.
Actuator = composed of the electronics, is where the actuator receives power,
and the control signal to determine the electrical signal required by the magnet
to move the stem to the correct position.
Valve = has the stem that connects the actuator to the valve disc. The disc varies
the area of flow through the valve body.
Control Valve
Flow Limiter
Automatic
Pressure
Regulator
Actuator
Valve
Electronics
Magnet
Valve Stem
Body
Disc
Bonnet
Plug
Stern
Body
Seat