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Installation and Operating Instructions
Installation
These instructions are issued as guidelines only and do not cover all installed conditions. If unsure
please contact our Technical Helpline on 01473 277400, before installation.
• It is advised that the valve should be installed in a run of pipe of the same nominal size.
• Hattersley products are designed for installation and use within suitably designed systems
reflecting CIBSE, BSRIA and HVAC guidelines. Particular care should be taken with regards to;
o Accessibility to valve for setting/adjustment
o Tube cutting – after cutting and threading, the end must be deburred or reamed
before fitting to the valve.
o Jointing – no thread jointing materials must be allowed to protrude inside the bore.
o Bracketing/supports – the piping system shall provide suitable support and must be
carefully aligned and at the correct distance between centres for the size and type
of valve.
• Orientation: The Fig. 1051 can be positioned in any orientation.
• Normally installed on return pipework, i.e. after the equipment it is controlling, but can be
installed in flow if required.
• Ensure direction of flow is correct - indicated by an arrow on the valve body.
• Fig.1051 operates between a minimum and maximum pressure drop across the valve -
see commissioning section on page 4.
• CFR's are not designed as isolation valves. Dedicated isolation valves should be installed
to isolate against system pressure, i.e. for maintenance etc., when disconnecting/draining
pipework.
• Care should be taken to not exceed maximum operating differential pressure, to prevent
damage to the internal components.
• Systems should be installed with strainers to protect the CFR and other installed items.
• Straight lengths of pipework are not required for CFR's but some straight lengths are
recommended to create a more stable flow pattern.
Flushing
Control valves, like the CFR, are sized to give good control over the
system water, therefore, have been designed with a small convoluted
flow path. These water ways may not allow adequate water velocities
for flushing of the coil, even when fully open. Therefore, in line with
BSRIA recommendations, it is recommended that a flushing point
be located between the coil and the CFR. This allows the coil to be
flushed without the water passing through the CFR.
Please refer to BSRIA Guide BG29 – 2012 for guidance.
02
Hattersley Constant Flow Regulator
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