VACUVENT VA Series, Owner'S Manual

Page: 13 / 18

Independent Valve Marketing (Pty) Ltd
Engineering Page 13 of 18
VSS0203WD00
for 3” to 8” Air Valves for design pressures from 363 Psi up to 580 Psi, for higher sizes and /or
pressure ratings please consult us. Although we do not prescribe the type of valve that must be
used as an Air Valve Isolating Valve we generally recommend that the valve should be allow “full
bore” flow through it so that air flow is not restricted in any way.
AIR VALVE CHAMBER
An Air valve chamber should provide adequate drainage of water. An air intake and outlet should
also be provided that is of the same nominal bore or greater than that of the air valve so that a free
flow of air can enter and exit the chamber effectively.
INSTALLATION
SCREW TYPE
Screw type valves need to be installed following standard practices. It is however recommended to
mount the valve using PTFE thread tape. The air valve isolating valve can be screwed onto the air
valve prior to installation on the pipeline using a spanner on the hexagon section on the air valve
isolating valve whilst securing the air valve firmly. DO NOT USE A PIPE WRENCH ON THE AIR
VALVE AND ON THE BARREL OF THE AIR VALVE. THIS MAY RESULT IN DAMAGE TO THE
COATING AND/OR MECHNICAL DAMAGE TO THE AIR VALVE.
FLANGED TYPE
Flanged type air valves require a suitable gasket to go between the mounting surface and the air
valve. Bolts should be placed though all the holes located on either flange with washer at both ends.
Bolts should be tightened in a crosswise fashion.
REMOVAL
SCREW TYPE
Removal of screw type valves are simple, first close the isolating valve located beneath the air
valve, then secure the isolating valve with a spanner on the hexagon section on the air valve
isolating valve and then using a suitable size flat bar or edge of spanner between the tightened tie
rods on the top of the valve lever the air valve in an ant-clockwise direction thereby loosening and
removing the air valve. DO NOT USE A PIPE WRENCH ON THE AIR VALVE AND ON THE
BARREL OF THE AIR VALVE. THIS MAY RESULT IN DAMAGE TO THE COATING AND/OR
MECHNICAL DAMAGE TO THE AIR VALVE.
FLANGED TYPE
Close the isolating valve beneath the air valve and thereafter loosen all nuts and carefully remove
the bolts and washers, care should be taken on the fusion bonded coating that no damage occurs.