ZTVB ZTRB
ZTVB/ZTRB
ZTVB/ZTRB
2- and 3-way control valves, DN25...DN40
• For water and refrigerants (max. 30 % glycol)
• Fluid temperature 1...110°C
• Pressure class PN16
The valves in the range ZTVB/ZTRB are used to control
heating and cooling in climate, heating and ventilation
systems. They are intended to be used together with the
RVAZ4 actuators.
• Rangeability 50:1
• For differential pressure up to 250 kPa
• No leakage when the valve is closed
The control valves in the ZTVB/ZTRB range are available
as 2- and 3-way versions. Body and plug in brass, spindle
in stainless steel and O-ring made of EPDM. The valves
have linear flow characteristics.
Function
The 2-way valve is closed when the spindle is in its
highest position and completely open when the spindle is
in its lowest position.
The 3-way valve is closed between port A and port AB
(the ports opposite to one another) when the spindle is in
its highest position. In this position, the valve is also open
between the bottom port B and the common supply port
AB. When the spindle is in its lowest position, the 3-way
valve is completely open between port A and port AB and
consequently closed between the bottom port B and the
common port AB.
AB
A
2-way valve
AB
A
B
3-way valve
Installation
The valve is to be mounted with the spindle vertically or
90° to the right or left. It must not be mounted with the
spindle pointing downwards. At high media temperatures,
the valve is to be mounted with the spindle to the side in
order to minimize heating of the valve actuator. For the
plug to seal properly, the 2-way valve is to be mounted
with the arrow on the valve body pointing in the flow
direction.
The 3-way valve is of mixing type and must be mounted
in the mixing point, according to the flow direction marks
on the valve.
No leakage in closed position
The valve has O-ring sealing between plug and seat,
which makes it completely tight in closed position. This
makes the valve very energy-efficient.
Typical applications
The valves are used to control hot and cold water in
heating, ventilation and climate systems. They can also
control refrigerants in for example liquid recovery
systems.
Valve actuator
The valves are intended to be used together with the
RVAZ4-24A (0...10 V) or RVAZ4-24 (3-position)
actuators.
revision
02 2011