Flowserve Cast Globe Valves - Manual (Page 11)

Globe Valves FCD ADENIM0011-00
11
3.0 INSTALLATION INSTRUCTIONS
3.1 Rigging
When lifting the valve for installation in the line, it is important that slings of adequate size are used. The capacity of the
sling must exceed the weight of the valve with its actuator. Slings should pass under the valve body and through the
yoke arms. Block care fully to prevent damage or abrasion of components and finishes.
3.2 Cleaning
Prior to installation remove the valve end covers and inspect for cleanliness. If any sign of foreign matter is observed in
the valve internals, open the valve and place it on its side-(stem horizontal) and flush thoroughly with water. Steam or air
may be used if water is net available but exercise caution that the high velocity does not drive debris into clearance
spaces.
3.3 Installing Valve In Line
3.3.1 The pipe must be properly supported and aligned with the valve. Seat leakage in valves is frequently caused by
seat misalignment resulting from excessive end moments introduced in the cold springing of the connecting pipe.
3.3.2 Before welding valves with weld ends into the line, raise the disc off the seat a sufficient distance to prevent arcing.
3.3.3 Extreme care must be taken to insure that globe valves are installed with the flow arrow in the proper direction.
When used for throttling, globe valves supplied with quick opening and parabolic discs must be installed with flow
from under the disc. When supplied with a cage disc the valve must be installed with flow from over the disc.
Failure to install valves used for throttling with the flow in the proper direction can cause damaging cavitation and
erosion of critical surfaces.
3.3.4 While valves used for isolation may be installed with flow in either direction, a more reliable seal will be provided if
the flow is from over the disc.
3.3.5 It is recommended that globe valves be installed with the stem vertical. This orientation provides enhanced
packing life and simplifies disassembly & reassembly.
3.3.6 Globe 'stop check valves must be installed with the stem vertical. Installation in any other orientation will not
provide automatic reverse flow protection.
3.3.7 Following installation of the valve in the line, install the packing supplied with the valve. (See the maintenance
section 5.4 for specific instructions). This operation may be performed following valve cleaning if more convenient.
3.3.8 Before the valve is placed in operation, check all bolting for tightness and lubrication per section 5.5.