Flowserve Cast Flex Wedge Gate Valve - Manual (Page 11)

Cast Flex Wedge Gate Valves FCD ADENIM0010-02
11
3.0 INSTALLATION INSTRUCTIONS
(Continued)
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 not 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 weld end valves are welded into the line, raise the disc off the seat a sufficient distance to prevent
arcing.
3.3.3 Gate valves may be installed with either port upstream or downstream. However, check the assembly
drawings for specific orientation requirements of the handwheel which may dictate the port location.
3.3.4 It is recommended that the valve be installed with the stem vertical, when possible. This orientation provides
enhanced packing life and simplifies disassembly/reassembly.
3.3.5 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.
3.3.6 Before the valve is placed in operation, check all bolting for tightness and lubrication per section 5.5.
4.0 OPERATING THE VALVE
Prior to operating the valve for the first time, verify that the valve has been prepared in accordance with the preceding sections of this
manual.
4.1 Hand Actuated
Handwheel actuated valves close on clockwise rotation of the wheel and open counterclockwise. This is true also for
the handwheel on gear and motor actuators.
4.1.1 Anchor/Darling gate valves, if properly set up and maintained, will close with only ordinary effort on the
handwheel. The maximum total force at the rim of the handwheel will not generally exceed 100 Ibs. and will usually
be much less. If tight shut-off is not achieved, do not use "cheaters" or other means of extra leverage. Instead, open
and close the valve once in an attempt to dislodge any foreign matter on the seating area that may be interfering with
closure. If this fails, disassemble the valve and inspect the internals for galling or other damage.
4.1.2
The impactor feature on valves supplied with impactor handwheels is intended to be used only in unseating
the disc. If the impactor is used to seat the disc, it may be difficult or impossible to reopen the valve.