Need good quality but inexpensive in line check valves
I need to fix a plumbing mod I did for the black tank. There is a plugged 1/2 NPT female connection on one end and one side of the tank. I removed the plugs and made and mounted a manifold with 2 ball valves next to the dump valves. Each valve has a hose running to a tank connection. At each connection I added a 1/2 NPT elbow with a 1/2 NPT plastic inline check valve.
What I did works pretty well for flushing and rinsing the tank. However, the check valves springs are only rated at about a half pound. When setting while camping and the black tank is being filled, there is no pressure to keep the check valves seated. This causes black tank water to seap back through the check valves and back down the hoses to the manifold. Since I originally didn't expect the check valves to leak I used PVC for the manifold and ball valves. In freezing weather a PVC fitting cracked and dripped black tank water.
The brass check valves for the water heater outlet and city water hookups are also pretty weak ruling them out for my use.
I looked for decent quality brass check valves with NPT threads and springs rated at about 5 lbs. This would be more than enough spring pressure to keep the valves seated and stop back flow from the black tank. The only ones I could find we're pretty expensive at over $50 apiece.
I am not going to replug the connections and add tank rinsers. As I indicated it works well except for the back leakage through the check valves. Better valves will solve the problem.
Does anyone know where I can find any brass inline check valves with at least 5 lb springs that are cheaper?
What I did works pretty well for flushing and rinsing the tank. However, the check valves springs are only rated at about a half pound. When setting while camping and the black tank is being filled, there is no pressure to keep the check valves seated. This causes black tank water to seap back through the check valves and back down the hoses to the manifold. Since I originally didn't expect the check valves to leak I used PVC for the manifold and ball valves. In freezing weather a PVC fitting cracked and dripped black tank water.
The brass check valves for the water heater outlet and city water hookups are also pretty weak ruling them out for my use.
I looked for decent quality brass check valves with NPT threads and springs rated at about 5 lbs. This would be more than enough spring pressure to keep the valves seated and stop back flow from the black tank. The only ones I could find we're pretty expensive at over $50 apiece.
I am not going to replug the connections and add tank rinsers. As I indicated it works well except for the back leakage through the check valves. Better valves will solve the problem.
Does anyone know where I can find any brass inline check valves with at least 5 lb springs that are cheaper?
