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5
Installation
5.1
Preparation
a) The working area should be clean and clear of any debris that would
contaminate the valve.
b) When despatched, V-flow control valves contain special lubricants which aids
the bedding in of the valve. The will ensure long life on control valves with metal
seats.
c) Some valves contain a silica gel pack inside the ball cavity to absorb humidity
during storage. These must be removed before installation along with all other
protective packaging.
d) The gland nut locking clip must be retained at all times. During installation, if the
locking clip is not in place, the gland nut must be adjusted to the correct torque
and a new locking clip must be fitted.
e) Significant problems can arise with any valve installed in an unclean pipeline.
Ensure that the pipeline has been flushed clean of dirt, weld spatter etc. before
installation.
f) Graphite seals should be handled with care due to their delicate nature.
g) If transit seals are fitted inside the valve, these must be discarded and replaced
with the spare body seals supplied.
5.2
Installation
a) Standard valves are bi-directional and may be installed in either direction. Valves
with an upstream pressure relief hole (Q190 ball) are uni-directional and must be
fitted with the flow arrow pointing downstream.
b) It is recommended that the valves are in the open position during fitting.
c) Installation of flanged valves should follow site standards. If these standards do
not exist, the following should be used as a guideline:
•
Flanged joints require compressive loading on the gasket material in order
to contain the line pressure that acts to separate the joint.
•
Pipework should have the correct gap to allow for the valve face-to-face
length and gasket material thickness.
•
Ensure the pipeline and flange faces are clean and free of any debris
which may be affect flange sealing.
•
Bolting should be of the correct size, length and material for the
application.
•
Locate the valve between the pipe ends and slide in the gaskets. Care
should be taken to prevent damage to the sealing surfaces.
•
Assemble all bolts and loosely tighten. Gradually tighten bolts opposite to
each other to the correct torque required for the specific gasket material.
Worcester V-Flow 51 / 52 Series User Instruction – WCENIM0026-01
Page 6 of 15
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