Repair Of Stainless Steel Ball Valves

A long service life and maintenance-free period will depend on several factors: normal operating conditions, a harmonious temperature/ pressure ratio, and reasonable corrosion data

Note:

●When the ball valve is closed, there is still pressure fluid inside the valve body
● Before maintenance, relieve the pressure of the pipeline and keep the valve in the open position
● Before maintenance, disconnect the power supply or air source
● Before maintenance, detach the actuator from the bracket

(1) The filler must be locked again
● If there is a slight leakage at the packing culvert, the stem nut must be locked again (13).
● Be careful not to lock too tightly, usually lock 1/4 ~ 1 circle, and the leakage will stop.

(2) Replace the valve seat and seal.
(A) Disassembly
● Make the valve in the half-open position, flush and remove the dangerous substances that may exist inside and outside the valve.
● Close the ball valve, remove the connecting bolts and nuts on the flanges on both sides, and then completely remove the valve from the pipeline.
● Sequential disassembly of the actuator-actuator (20), connecting bracket (18), anti-loosening washer (14), valve stem nut (13), butterfly shrapnel (12), Garnan (11), wear plate (10), valve stem packing (9)
● Remove the connecting bolt (5) and nut of the body cover, separate the valve cover from the valve body, and remove the valve cover gasket (16).
● Confirm that the valve ball (3) is in the "off" position, which makes it easier to remove it from the valve body and then remove the valve seat.
● Gently push the valve stem (6) down from the middle hole of the valve body until it is completely taken out, and then take out the O-ring (8) and the packing under the valve stem (7)
Note: Exercise caution to avoid abrasion to the stem surface and body stuffing box seal

(B) Reassembly
● Clean and inspect the removed parts, and it is highly recommended to replace the seals such as the seat and bonnet gasket with a spare parts kit
● Assemble in the reverse order of disassembly.
● Use the specified torque to cross-lock the flange connecting bolt (5).
● Lock the stem nut with the specified torque(13)
● After installing the actuator, input the corresponding signal to drive the valve core to rotate through the rotating valve stem, so that the valve can be opened and closed position.
● If possible, please test the pressure seal and performance of the valve according to the relevant standards before reloading the pipeline.

Model representation:
Like the previous valve Q11S-16C, where the "S" represents the older method, the "S" represents the plastic seal, and the "F" represents the PTFE or PTFE material