M&J Valve Gate Valve RQ-8A

Stem Protector Removal and Inspection

Remove the stem protector including cap and sealing device

Is the valve equipped with an old style rubber grommet indicator rod seal?

Contact M&J Valve for parts list and pricing information if replacement is needed

Valve Stem Inspection and Cleaning

Inspect valve stem threads for damage and lubrication

Clean the stem threads using a wire brush if required

Apply M&J Valve recommended grease to the threads

Cycle the gate to the full open position.

Remove the stem protector, including cap and sealing device.

If there is a downstop bolt on top of the valve stem, remove the indicator rod and downstop bolt.

Inspect valve stem threads for damage and lubrication.

Apply a coat of light oil or a lubricant such as WD-40 to the stem threads and top of operator drive nut.

CAUTION: DO NOT, Under any circumstances, attempt stem maintenance on valves WITHOUT cupola while exposed to line pressure.

NOTE: A replacement stem should be available prior to disassembling the valve. If not carried in field stock, it can be ordered from M&J Valve. M&J Valve also recommends replacing the stem packing and O-rings whenever the valve is disassembled. Always include the serial number in any correspondence with M&J Valve concerning your valve.

Isolate pressure source from the pipeline and valve.

Cycle the valve to the mid travel position to allow venting of both the valve body and pipeline.

Open body pressure relief valve to vent trapped body/line pressure.

Cycle the valve to the full open position after venting is complete.

Remove the following components

Pre-maintenance Safety and Preparation

Ensure no stem maintenance on valves without cupola while exposed to line pressure.

Verify replacement stem is available.

Record valve serial number for correspondence with M&J Valve.

Pressure Isolation and Valve Preparation

Isolate pressure source from pipeline and valve.

Cycle the valve to the mid travel position.

Open the valve body pressure relief valve to vent trapped body/line pressure.

Cycle valve to the full open position after venting is complete.

Partially test cycle the manifold valves

Run the manifold valves through a full cycle if field conditions allow