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A pressure balance shower valve addresses temperature flux only due to inlet pressure changes. The internal mechanism is designed to maintain water temperature despite pressure fluctuations in the hot andr cold supply. As an example, when someone flushes the toilet it will not cause the water temperature in the shower to suddenly get too hot. The pressure balance valve does not sense the actual temperature of the water, just the ratio of hot and cold water supplied to the valve.A pressure balance shower valve addresses temperature fluctuation only due to inlet pressure changes. The internal mechanism is designed to maintain water temperature despite pressure fluctuation in the hot or cold supply. As an example, when someone flushes the toilet it will not cause the water temperature in the shower to suddenly get too hot. The pressure balance valve does not sense the actual temperature of the water, just the ratio of hot and cold water supplied to the valve.In consideration of the pressure balanced mixing valve in a home shower fixture, there is a cartridge in the single lever design. Once the lever is removed the cartridge is located inside where the hot and cold supply lines converge. Adjusting the shower water temperature is accomplished by changing the Rotational Limit Stop (RSL) position which limits the shower handle range of movement. This is a mechanical piece located between the handle and the inner cartridge. The Rotational Stop Limit (RLS) sets how far the shower handle can be moved toward the hot or cold side. In consideration of the pressure balanced mixing valve in a home shower fixture, there is a cartridge in the single lever design. Once the lever is removed the cartridge is located inside where the hot and cold supply lines converge. Adjusting the shower water temperature is accomplished by changing the Rotational Limit Stop (RSL) position which limits the shower handle range of movement. This is a mechanical piece located between the handle and the inner cartridge. The Rotational Stop Limit (RLS) sets how far the shower handle can be moved toward the hot or cold side. The mixing cartridge is behind the RLS, and it is in the mixing cartridge that the pressures are regulated.Hard water and mineral deposits as well as rust from aging galvanized pipes commonly causes the cartridge to fail prematurely. This is because the inner device within the cartridge is mechanical and constantly moving back and forth while you are showering. The hot and cold water enters from both sides via the supply lines and is mixed in the cartridge cap then flows out the base to the outlet in back of the shower valve body. Rubber flapper type backflow prevention valves are necessary for the automatic pressure balance valve inside the lower housing to operate. Hard water and mineral deposits as well as rust from aging galvanized pipes commonly causes the mixing valve in the cartridge to fail prematurely. This is because the inner device within the cartridge is mechanical and constantly moving back and forth while you are showering. The hot and cold water enters from both sides via the supply lines and is mixed in the cartridge cap then flows out the base to the outlet in back of the shower valve body. Rubber flapper type backflow prevention valves are necessary for the automatic pressure balance valve inside the lower housing to operate.