In order to control the water, your pressure-reducing valve will be controlled by the amount of pressure inside the Valve. The water pressure-reducing valve is often placed at the front of pipes outside of the home, so that you can get the pressure reduced to all of the different areas of your home. Once the pressure valve is fitted, when you turn on the water at a faucet, the pressure coming through to the valve forces down the globe. The spring in the bell keeps the valve from being pushed away by the water, meaning that the flow of water loses energy as it tries to flow past the globe. The actuator in this case is the spring, which keeps the globe from moving up and down in response to the pressure of the water.