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Pressure Valve

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Pressure Valve
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RVers want lots of hot water, so we light our water heater and forget it. Unless there is a problem, then we're stuck! So, this article may make the RV water heater workings a bit easier to understand.

The basic RV water heater is LP gas (pilot light) with a 6 gallon tank. The inner tank is bisected with a tube that is heated by a gas valve. This valve does double duty as a thermostat, heating the water to the proper temperature, and as a safety valve which will shut off the LP when the pilot goes out. The water travels into the tank at the bottom, surrounds the tube and is heated, then is released out the top. The tank will fill before water can go through the rest of the camper's water system.

An upgrade to the basic gas pilot model is DSI, or direct spark ignition, which is lit from inside the camper. Also available are LP gas and electric models. A heating element is added as an alternate way to heat the water. Some motor homes have water heaters with heat exchangers that pipe the water through the engine compartment while traveling, so you have hot water when you stop for the night!

There are two main manufacturer of the RV water heater: Atwood and Suburban. They come 3, 6, 10 and 12 gallon models. The following are tips to help you keep your RV water heater trouble free:

Always make sure your water heater is full before lighting. You can check by opening a hot water faucet and waiting until there is a steady flow.

Drain and flush your water heater after every trip. On Suburban models the anode rod is removed to drain the tank. Atwood has a plug usually located in the bottom left corner of the water heater. Get to both these drains by opening the outside WH door.

Check the exterior vent and burner area for mud daubers, spider webs and anything else that will obstruct the air flow.

Winterize properly. If your RV is not equipped with a by pass, install one now. This will keep the antifreeze from filling your tank.

A common problem found with RV water heaters is foul smell - like rotten eggs. This is caused by high sulphur levels. Though unpleasant, it is not harmful. Flush and sanitize the water system to get rid of the smell. You can use vinegar or bleach to do this. There are water fresheners available that will sanitize without the bleach smell. Remember to flush with clean water after sanitizing.

Another common problem is water leaking at the pressure relief valve. This is caused by the normal air pocket at the top of the water tank being absorbed by the water. The cure for this is to turn off the water heater and let the water cool. Then shut off the water supply to the water heater, open a faucet inside your camper to let off the pressure, open the pressure valve on the water heater and let the water flow until it stops on its own, then snap shut the valve, close the faucet, and turn the water supply back on. These are not signs of a defective water heater.

Other issues such as sooting, or problems with the water heater staying lit could be signs of trouble with the gas valve or circut board, and should be checked by a certified RV technician.

For more information about the RV Parts noted above, please check out RVPartsDealer.com where you will find a huge variety of the newest RV Water Heater.

The China Valve Development of 2010 Facing The Transformation

With the transfer of oil development towards mainland and offshore, as well as the power industry changing from under 300,000 kilowatts thermal power to above 300,000 kilowatts of thermal also hydropower and nuclear power, corresponding changes in its performance and parameter shoule be based on changes in equipment applications. Urban systems are generally use a large number of low-pressure valves, and to the development of environment-friendly and energy-saving, that is, from a low-voltage iron gate valves used in the past gradually shifted environment-friendly plastic sheet valve, balance valve, metal sealed butterfly valve and the center line butterfly valve sealing. Oil and gas transmission projects to develop in the direction of the pipeline. From the energy conservation perspective, the steam trap should be developed, and to the high parameters development of the sub-critical and supercritical.

The construction of the power plant move to the large-scale development, and therefore it requires larger diameter and higher pressure and also need quick-open and close valve. The needs of the complete works develop from single species to a multi-species and multi-standard. The valves required for one project are all provided by an exclusive valve manufacturer has become the trend. Such as Guanfa Valve

Generally speaking, China's price system is relatively stable, although has a slight up or down every year. According to the North China valve market, we found a number of companies make a profit shoddy, they disturbed the valve market badly. The main problems in the valve market are: First, some of the operators purchase the factory site of non-factory name, and print the brand-name and the certification of the well-known manufacturers, this cause serious harm to the reputation of businesses of qualified valve. Secondly, valve refurbishment, some of the operators do the second time sales through re-paint the waste valve, it bring serious security risks to the quality of the project.

Above provided by SelectChina.com, and find more information on China Machinery News / China Valve Manufacturers.p>

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Plumbing - What's the difference between a pressure bypass valve and a pressure relief valve?

This one's for serious plumbers!

Both are 2-port devices. relief valves seem to be half the price. Both seem to offer to let water through if the differential pressure reaches a certain level.
Thanks for the great answers!
It sounds like a relief valve empties to an outflow that has no back pressure.

My next task is to find a pressure bypass valve, preferably adjustable around 0.5-3 bar, in-and-out in line, and tiny. 16mm pipe would be ideal.

pressure relief valve fits to the boiler so if the pressure gets too high it opens and lets some water out to out side.A bypass fits  Between  the flow and return pipes to the rads and if all the rads valves shut off it opens and lets water still run through the boiler, two very didifferentalves so do not use one for the other job

Station's stubborn nitrogen valve finally pops open
After extended troubleshooting, space station flight controllers successfully coaxed open a stuck nitrogen tank valve Friday, finally re-pressurizing an ammonia coolant loop serviced during the shuttle Discovery's recently completed mission.

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