HIGH PERFORMANCE BUTTERFLY VALVES - MODEL SLHBF & SLHBFFS
Australian Pipeline Valve - Installation, Operation and Maintenance Manual
10
Valves with a short face-to-face dimension have to be mounted with disc in closed
position otherwise the valve disc could be damaged.
4.5 SAFETY PRECAUTIONS
- Ensure the line is depressurised and drained.
- Check the pipeline media. Care should be taken for protection against toxic and/or flammable fluids.
- Never install the valve without an operator already attached to the valve shaft.
- Never remove the operator from the valve while the valve is in the pipeline under pressure.
- Always ensure that the disc is in the full-closed position before installing the valve.
- Take care handling the valve.
5 . 0 I N S T A L L A T I O N
- Make sure the valve disc is fully closed. (Usually, valve is delivered with disc closed tightly to protect
the seat ring).
– Check the preferred flow direction indicated by the arrow on the valve body.
- Be sure to place a gasket between the valve and pipe flange.
- Refer Appendix A for bolt tightening sequence example. Gradually tighten more each rotation.
- See Diagram 3.
- Before installing the valve, the user must check the valve model, connection dimension and flowing
direction of the medium, ensure in accordance with requirement of valve. Confirm the construction
material list on nameplates (service, pressure, temperature) are appropriate for the application
intended and are as specified.
- Inspect the seat ring to make sure that it was not damaged during lifting & handling process. This is
especially important in case of valves shipped with the disc in the open position and with ‘fail-open’
actuators.
- Define the preferred mounting orientation with respect to the system pressure. If any (see the arrow
on body), identify the upstream side (high pressure) and downstream side (low pressure).
- Optimum valve installation is with the stem in a horizontal plane (with the actuator on top of the valve
not below it as any packing leaks could damaged the actuator/gearbox) or worse case have the stem
at an angle so as to minimise solid particles present in fluid that otherwise could deposit in the low
bearing area.
- Check the packing gland to ensure it is properly tightened.
- During installation, the disc must be in closed position.
- For working temperature above 200°C thermal insulation of valve body is recommended.
- The installer must have skilled and experience in valve installation and maintenance.
