How to Repair a Faucet Valve Seat

Sometimes a tap will continue to drip although you’ve changed the washer. This is usually because the valve seating has become scored and damaged by grit from the mains, so the washer can’t make a watertight connection.

You can use a reseating tool to put the problem right. This entails removing the headgear after the water has been turned off, inserting the tool into the body of the tap and turning it to cut a new seating. It won’t be worthwhile buying one of these tools for what is a once-in-a-lifetime job, but you may be able to hire one from a tool hire company.

An alternative method, and certainly one that’s a lot easier, is to use a nylon ‘washer and seating set’. Again with the water supply off, the headgear and the washer and jumper are removed from the tap end and the nylon liner is placed in position over the seating.

faucet valve How to Repair a Faucet Valve Seat

The jumper and washer are then inserted into the headgear, which is screwed back onto the tap. The tap handle is then turned to the off position. This action will force the liner into and over the old seating to give a watertight joint.

You can also use a domed washer to cure a poor seating. It increases the surface area in contact with the waterway and so effectively cuts off the flow when the tap is turned off even though the top of the valve seating may not be smooth

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