ASSEMBLY AND MAINTAINANCE INSTRUCTIONS
1 - Installation
1.1 - Checks
oCheck that the material of the valve body is chemically compatible with the fluid.
oCheck that the pressure and service conditions are compatible with the (P, T) diagram of the valve. See
§ “Service limits”
oCheck that the fluid is clean and free of particles. The latter could scratch the ball and damage the seats,
hence causing the valve to leak. If need be, install an upstream filter.
oCheck that there is no risk of thermal expansion of the fluid, which could damage the seats. In the open
position, a hole at the top of the ball balances the pressures between the body cavity and the flow of
the fluid. As an option, we recommend a relief hole upstream of the valve for balancing the pressures
for fluids such as ammonia, LPG, chlorine, etc.
oCheck that the valve is not used for flow or pressure control since it is not intended for this use and
there is a risk of premature wear of the seats, in particular in the event of high pressure and/or
temperature. For this special application, preferably use our ‘”V-port” version with a V-shaped hole in
the ball. Please contact us.
oCheck that the valve is not used on a gas which might condense at certain times during the process. In
such a case, the pressure within the body cavity could become negative, which could lead to a significant
deformation of the seats. Please contact us.
oStatic electricity: the valve will be supplied with a ball-stem-body internal electrical continuity tester. If
the service conditions require the electrical continuity of the installation, check its earthing.
oIf the valve is installed in an explosive zone, you must follow the additional “IMEVMATEX” instructions.
1.2 - Storage before installation
oFollow our general “IMESTOCK” instructions for storage.
oCheck that the tie-bolts of the valves were not loosen during transport.
1.3 - Installation
oBefore any installation, isolate the piping upstream and downstream, depressurize the piping and bring
the installation to ambient temperature. Carefully clean the piping of any particle (foreign body, dust,
rust, etc.) or shavings by water rinsing or air blowing.
oFor valves with a size above DN50, plan to use a hoist.
oRemove the protective tips from the valve ends.
oCheck the cleanliness of the internal surfaces of the valve and if need be, clean them.
oDirection of mounting: the valves do not have a preferred direction of mounting, unless a relief hole
was drilled into the ball.
oCheck the perfect alignment and the proper support of the pipe installation upstream and downstream
of the valve. Alignment defects cause mechanical deformations which can block the valve or lead to
leaks at the body gaskets.
