13
TC-003001-30 / Rev 01
Feb-02
FIELD TESTING
When field testing is required, the following procedures are recommended:
1.
Ensure that the test fluids are compatible with the valve seat and seal material
2.
Flush the system to remove foreign material that may be in the line as a result from installation
procedures to avoid damaging the ball and seats
3.
If performing line shell testing, the valve shall be in half open position. The maximum line pressure can be
1-1/2 times the valve maximum cold working pressure
4.
If performing seat testing, make sure the valve is fully closed. The maximum pressure for seat testing is
the maximum cold working pressure
5.
After completion of testing, purge all test fluids from the valve
CAUTION: If the seats are tested to a higher pressure than the maximum cold working pressure, the seats can be
permanently damaged. If a higher test pressure is desired contact a WKM representative for details.
OPERATION
370D6 series ball valves only work in the fully closed or fully open position; these valves work for on/off service
only.
WARNING: These valves shall never be operated partially open or partially closed. Throttling (partial opening) or
“pinching” flow may cause non-uniform wear on seats and ball over the sealing surfaces where it is exposed to
the flow line, preventing tight shut-off.
To close the valve, turn gear hand wheel clockwise until it stops; to open the valve turn the gear hand wheel
counter-clockwise until it stops.
All the wrench operated valves have the wrench levers aligned along with valve through bore when opened and
perpendicular with the through bore when closed.
All gear operated valves have the gear indicator aligned with the valve through bore when opened and
perpendicular with the through bore when closed. The gear also has “OPEN” and “CLOSE” markings.
While opening or closing, the ball must reseat; this reseating torque is higher than the run torque. Turn the hand
wheel until the gear has a positive stop.
If the valve is operated by a power actuator, carefully read the actuator operation manual.
CAUTION: The end stops have been shop set to assure the correct 90 degree rotation from the fully open to fully
closed position. Do not change their adjustment. If the valve is not correctly reseated at the end of opening or
closing, the ball and the seats can quickly be damaged when exposed to flow pressure, preventing tight shut-off.
