IM-P204-03
CH Issue 8
10
Note: Before actioning any installation observe the 'Safety information' in Section 1.
3.1 General information
The valve should be installed in a horizontal pipeline.
For operating temperatures below 125
°C the valve may be installed either vertically upwards
or vertically downwards (see Figure 4).
For operating on steam or temperatures above 125
°C the valve must be installed vertically
downwards with the spring / actuator below the pipework with a water seal pot fitted on the
downstream control signal line to the actuator, a typical installation is shown in Figure 5.
Care should be taken to install the valve correctly as indicated by the direction of flow arrow
on the valve body.
3. Installation
Fig. 4 Typical installation for
downstream temperatures below 125 °C
the valve can alternatively be mounted
vertically upwards.
*
1 m or 15
pipe diameters
minimum
*
*
Steam
Steam
Condensate
Fig. 5 Typical installation for downstream
temperatures above 125 °C
*
*
WS4 water seal pot
Steam
Steam
Condensate
3.2 Pressure control pipe
The valve actuator signal connection must be piped directly to the downstream side. To
provide a good control signal the downstream sensing point should be positioned a minimum
of 1 metre or 15 pipe diameters away from the valve or change in pipework direction on either
side. It is recommended that the actuator signal pipe should be 8 mm diameter copper or
stainless steel of 1 m minimum length.
3.3 Preventing dirt
Before installing the valve the system pipework should be flushed out to remove any residual
dirt or scale that may be present. The valve should be protected by a pipeline strainer of the
same size as the upstream pipework. For steam applications the strainer should be installed
on its side to prevent the accumulation of water.
Summary of Contents for DLV7
Page 40: ...IM P204 03 CH Issue 8 40...
