Passage D connects the outlet port to the bottom of the spool. This flow is out the drain port and should be returned directly to the tank. The position of the adjusting screw sets the spring load on the poppet, which determines the setting of the valve. An integral check valve allows reverse free flow from outlet to inlet port even at pressures above the valve setting. If you need to adjust the pressure of your boiler's pressure reducer ("water feeder") see. Pressure reducing valve will be normally open. Hold the valve assembly against a water pipe and mark where to cut the pipe. 1. In the event of over-pressure, this valve release the pressure, and in case a vacuum is created in the tank, this valve allows air to enter the tank. Backpressure in the drain line adds to the spring setting, thus raising the set pressure. Figure 5-4 shows a pressure reducing valve. The DGMDC direct check valve should be placed nearest the directional control valve. The position of the spool determines the size of passage C. When pressure at the valve inlet (diagram A) does not exceed the pressure setting, the valve is completely open. Pressure reducing valve is normally open valve and it allows the pressurized fluid to flow but when the pressure at the output of the valve is more than the valve pressure setting, a pilot pressure pushes the arrow down and the path will close. This valve serves the function of the relief valve and vacuum valve. Here's how water pressure reducing valves can help: View our product line guide for more on controlling water pressure in residential, commercial, and OEM applications. Liquid from the main circuit enters the valve at the inlet port C, flows past the valve spool, and enters the branch circuit through the outlet port D. Pressure at the outlet port acts through the passage E to the bottom of spool. This increases the valve’s resistance to flow, creates a greater pressure drop through the valve, and reduces the pressure at the outlet port. Water pressure reducing valves control and protect plumbing systems by reducing the downstream pressure. There are three types of pressure reducing valves. A relief valve in a main circuit is adjusted to a setting above 800 psi to meet a main circuit’s requirements. It is often referred to as a pressure regulator. Back flow would close the valve and pressure would increase. A device, usually a few inches across and often shaped a bit like a bell, may be found installed quite close to the building water meter. 2 Slide the cover provided over the flow valve and clamp the valve in a vise. Looking for help with product questions, support or a quote? With intermittent and/or fluctuating backpressure, the reduced outlet pressure changes when the backpressure changes. Schematic Diagram Item Description 1 100-01 Hytrol Main Valve 2 X44A Strainer & Orifice 3 CRD Pressure Reducing … © 2021 Hydraulic Valve. See the illustration at the top of this page and at left. For example, in a system, a branch-circuit pressure is limited to 300 psi, but a main circuit must operate at 800 psi. On the bottom of the diaphragm, the outlet pressure of the valve forces the diaphragm upward to shut the valve. The pilot valve limits the pressure in chamber F. More pressure rises as the outlet pushes the spool upward against the combined force of the spring and the pressure in chamber F. As the spool moves upward, it restricts the opening to create a pressure drop between the inlet and outlet ports. Steam, liquids and gases usually flow at high pressure to the points of final use. Liquid from the main circuit enters the valve at the inlet port C, flows past the valve spool, and enters the branch circuit through the outlet port D. 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