Manual TRV20

VSXF-2/-3/-4 – PRODUCT DATA
5 EN0B-0617GE51 R1211
OPERATION
In the case of the two-way valve, the three-way valve, and the
three-way valve with bypass, the built-in spring produces a
closing force on the A-B / A-AB ports.
The valves are supplied with a screwed-on adjustment cap for
manual operation and for protection of the stem. If it should
become necessary to flush the system, the valve can be
opened between approx. 50% and 75% of the rated k
VS
with
the protection cap attached or fully opened via a connected
actuator.
Typical Operation
All types of valves should be mounted in the return flow. If the
p-values exceed 300 kPa, attention should be paid to the
development of noise.
Two-Way Valves
Direction of flow always from port A to port B
Port B: Outlet
outlet
inlet
+
-
outlet
inlet
+
-
Fig. 1. Two-way valve operation
Three-Way Valves
These valves are preferably used as mixing valves, this
means:
Port AB: Total flow outlet
Port A: Controlled flow inlet
Port B: Bypass inlet
AB A
B
inlet
+
-
AB A
B
inlet
+
-
Fig. 2. Three-way valve operation
Three-Way Valves with Bypass
These valves simplify the installation, which is depending on
the layout of the pipework, as the bypass pipe is part of the
valve. The information for the normal three-way valves is also
valid for this type.
AB A
B
inlet
+
-
AB A
B
inlet
+
-
Fig. 3. Three-way valve with bypass
MOUNTING
When installing the valve care must be taken that the flow
direction is correct (see section "Typical Operation"). The
valve must not be mounted with the stem pointing downward.
The adjustment cap must be removed from the valve only
when the actuator is fitted. The valve should be installed as
stress-free as possible with a tightening torque of 25 to
30 Nm.
The valve is supplied complete with mounting instructions.
The water quality must meet VDI 2035 requirements.
NOTE: Mount the actuator by hand, only. Do not use a tool,
as this could result in damage.
MAINTENANCE / SPARE PARTS
The valves do not require any maintenance.
In case of failure or leakage, the valve must be replaced. No
spare parts for the valve or sealing are available.
DISPOSAL
Statutory regulations and/or environmental protection
considerations may require special handling in disposing of
the valves.