3.531.5275.200
10
4. Installation
After installation or any maintenance work, check the whole operativeness of the system and test
all the alarms and protection devices.
To commission the plant, slowly increase the pressure, avoiding sudden pressure and temperature
variations; simultaneously check presence of leakages at piping connections and on the body of
the valve, till achievement of working full pressure. This process is hazardous, and must be worked
out with the utmost care.
In leakage case, immediately relive the pressure proceed with appropriate action to restore the
tightness.
Sizes of handwheels are proportioned to the driving force required for the operation of the valve.
For no reason supplementary levers should be employed. to operate the valve.
Regular operativeness has to be controlled carrying out some opening and closing cycles.
For GXM threaded valves, in case of leakage of shaft seal, the graphite packing rings must be
compressed by tightening the provided threaded nut of the stuffing box, while with flanged valves
the compression must be done by clamping the two stuffing box nuts.
5. Commissioning
Note: before actioning any installing operation observe the ‘General safety information’ in
Section 1.
4.1 General rules
Unpack the valve and remove protective covers from the joints, taking care that any dust or dirt can
not enter into the valve. Subsequently, visually verify that the appliance is intact and haven’t suffered
damages due to transport and storage; otherwise do not proceed to installation.
Check again that the label’s data are compatible with plant’s requirements.
Check that no pressure exists in the plant and that the piping is clean, carefully blown and free from
foreign bodies that may cause irreversible damages to the seal between seat and plug. Damages
caused by particles of dust or dirt are not under warranty.
4.2 Installation
Valves may be installed on the piping in any position, in any case preferential arrangement may be
with handwheel or cap upwards; only the check valves model RJ205 must be installed on horizontal
pipe with the cup oriented upward.
It is always necessary to respect the flow direction, indicated by the arrow marked on the body of
the valve. Inlet and outlet piping must be appropriately supported and aligned, and pipe expansions
must not generate stress to the valves as they are not designed to withstand it. While positioning and
welding the piping, valve must be properly fixed and supported. Threaded valve clam ping must
not
involve further stresses to the equipment and the material employed for joints must be appropriate
and compatible with plant requirements and specifications.
Flanged connections must be accurately cleaned to assure perfect positioning and tightness of the
gasket. Gasket must be perfectly centred to avoid obstruction inside the passages. Allow a safe
access and free space all around the handwheel to carry out work. Flange bolts must be tightened
following crossed sequence, adequate to obtain co planarity and uniform clamping.
Do not proceed to tighten the bolts in lack of co planarity or when flanges are excessively spaced.
During painting works, protect the valve stem. Before commissioning the plant and in any case after
maintenance works, piping must be accurately washed and blown, keeping the valve completely
opened to remove every possible foreign body.
4.3 Hydraulic test
When an hydraulic test of the plant is required, the declared test pressure must never been
exceeded.
Summary of Contents for GXM16Z
Page 2: ...3 531 5275 200 2...
