1. The drain valve is usually at the base of the furnace. 2. Both systems have drain valves at the base of the furnace. 3. Each feed is also fitted with a drain valve for cleaning each sight glass. 4. Now position a bucket under the boiler drain valve . 5. Many tankers are equipped with fast-drain valves on the sides and back of the truck. 6. Experts have since identified the malfunction _ a faulty drain valve _ and fixed it. 7. If water pressure is bled away through a drain valve , obviously that will reduce its pressure too. 8. Release the pressure, open the drain valve and ring tubing, while maintaining air flow through the system. 9. After the tank has been drained, close the drain valve and vacuum-breaker plug then open the shutoff valve. 10. Q . The drain valve on my hot water heater is closed and I can't get it open.
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