If the refrigerant has escaped, get a a/c valve stem kit from a autoparts store. They cost a few dollars and come with a stem tool and a few valve stem core that resemble tire valve stem cores.
If you still have pressure, you will need a special tool that costs about 40 bucks.
Replace the valve seal and check the valve guide for wear.
Yes, you remove the rockers, add air pressure in the cylinder through the plug hole and use a valve spring compressor to remove valve spring. You can now change the valve seal.
To fill a Schrader valve properly, first ensure the valve cap is removed. Then, attach the pump nozzle securely to the valve. Pump air into the valve until you reach the desired pressure, as indicated on the gauge. Finally, remove the pump nozzle and replace the valve cap to seal it.
To replace the flush valve seal in a toilet, first turn off the water supply to the toilet. Remove the tank lid and flush the toilet to empty the tank. Disconnect the flapper chain and unscrew the flush valve nut. Remove the old seal and replace it with a new one. Reassemble the parts and turn the water supply back on.
To replace a Kohler flush valve seal, first turn off the water supply to the toilet. Remove the tank lid and flush the toilet to empty the tank. Unscrew the flush valve nut and lift out the old seal. Clean the area and install the new seal, then reassemble the parts and turn the water supply back on.
To replace the bad valve seals on a 2000 Dodge Neon ES, first, you will need to remove the valve cover to access the valve seals. Next, you will need to use a valve spring compressor tool to compress the valve spring and remove the valve spring retainer, spring, and seal. Replace the old valve seal with a new one, ensuring it is properly seated and lubricated before reassembling the valve components. Repeat this process for each valve seal that needs replacement.
Replace valve seal
If your pressure vacuum breaker is leaking, it may be due to a damaged seal or valve. To fix it, you can try tightening any loose connections, replacing the seal or valve, or contacting a professional plumber for assistance.
Its called a valve cover gasket kit and the job should cost about 300.00 Parts and labor.
The system has pressure on it but the switch can be screwed off. A schrader valve prevents the loss of refrigerant. Install the new one after you have put some Air conditioning oil on the O ring seal.
If you are talking about a temperature and pressure valve on a water heater (pop off valve). It is controlled by spring pressure and a rubber seal. As pressure in the tank increases the tension exerted by the spring on the rubber seal is over come until the point at which excess pressure is released around the rubber seal. When the pressure inside the tank decreases the spring again pushes the rubber seal closed. Temperature of the water in the tank is directly related to the pressure.. higher temperature = more pressure.
The water valve may be leaking due to a worn-out seal or a loose connection. To fix it, you can try tightening the connections or replacing the seal. If the leak persists, it may be necessary to replace the valve altogether.