Model PRS09i-P

In-Line Plastic Pressure Regulator (Reducing Valve)

Printable Product Specs PDF Instructions Pricing

Spring operated-diaphragm pressure-reducing valve 1/2"-2" NPT THD Normal Inlet pressures to 150 PSI  Outlet pressures from 8 PSI to 80 PSI

Features Liquid pressure regulator parts made from solid bar stock materials. Body: PVC, CPVC, PVDF, PTFE (1/2"-2" sizes only).   Trim: Same as materials selected for the body. Teflon-Viton composite reinforced diaphragm is designed for optimal poppet travel. Teflon on the wetted side provides superior protection when used in a wide range of liquid applications.  Viton is used on the non-wetted side of the diaphragm. In-line valve ports: Simplifies installation for new or existing piping. Spring chamber: Standard material is PVC, but can be upgraded when required to meet specific applications.

Applications

This is a direct-acting diaphragm pressure-reducing valve (most often referred to as a pressure regulator) with an adjustable spring operating against a flexible elastomeric diaphragm subjected to the reduced outlet pressure of the valve which is controlled through an internal sensing port. This makes the valve an accurate pressure-sensing valve, or pressure-control valve used to control outlet pressures with a wide range of inlet pressures.

Unlike unbalanced diaphragm pressure-reducing valves, this pressure valve is a balanced inlet design and will work quite well on applications where the inlet pressure will fluctuate widely and will have little effect on outlet pressure. The valve will operate in a vertical orientation as illustrated, horizontal, or any other orientation.

This valve is designed for use with corrosive liquids, depending on the materials selected. See material display notes in pricing section to help select materials

When this pressure reducing valve is selected, it is always recommended that a relief valve be installed on the downstream side of the valve to protect the diaphragm and other equipment downstream of the valve in case of excessive pressure buildup. This is especially necessary when high inlet pressures are present. Therefore, do not attempt to use this as a shutoff valve. For prolonged or even momentary periods of shutoff, install separate shutoff or isolation valves to keep the relief valve from tripping. The standard construction for this pressure-reducing valve is with a soft seat which will provide class ANSI VI (Bubble tight) seal.

This in-line pressure regulator has fairly adequate Cv values for most applications. See below.

Options

Select the valve size, spring range, material options in the customized pricing and ordering section indicated by the red arrows. You have the ability to customize your valve choices by selecting the wetted materials, and choice of seat materials to suit your requirements. The standard nonwetted materials are PVC and Stainless steel as indicated in the Material List. Once your  selections are made a price quote can be generated and printed directly to your computer or immediately e-mailed to you. Or you may proceed to "Order and Checkout" to order On Line.

Principle of Operation

The valve operates on the principle of balancing the spring force that is set by the user against the outlet pressure acting under the diaphragm. There is an internal pressure balancing port that subjects the outlet pressure directly to the underside of the diaphragm. When the outlet pressure falls below the set pressure required by the system on the outlet side of the valve, the spring force overcomes the force balance under the diaphragm causing the poppet and diaphragm assembly to drop down causing the valve to open and allow higher pressure at the valve inlet to pass through the valve. When the pressure rises to a sufficient level to restore the force balance against the spring, the valve will move toward the closed position. The valve is completely self regulating and the poppet is constantly moving to respond to pressure changes on the outlet side of the valve, not the inlet. The only time the poppet closes completely is when the outlet pressure has been reached to its set point. As long as the valve is able to shut off properly without solids or other material build up in the seat or because of seat wear, the valve should be able to maintain and hold the outlet pressure and keep it from rising for brief periods of time. If the valve is set with no flow passing through the system, there will be some droop (drop in outlet pressure) caused by relaxation of the spring when the valve first has to open. This occurs with all direct spring operated valves and can be compensated by making a slight readjustment to the set pressure once the desired capacity has been achieved.

Plastic Pressure Regulator

PRS-09i-P Plastic Pressure Regulator

Material List and Specification

1. Adjusting screw SS 2. Lock nut SS 3. Spring chamber PVC 4. Spring pusher SS 5. Adjusting spring SS 6. Main valve PVC, CPVC, PTFE, PVDF 7. Lock nut SS 8. Nut, diaphragm SSS 9. Diaphragm PTFE / Viton 10. Seal Viton, EPDM, BUNA, Kalrez…etc 11. Body PVC, PVDF, CPVC, PTFE 12. Bottom plug PVC, PVDF, CPVC, PTFE 13. Seal Viton, EPDM, BUNA, Kalrez….etc 14. Lock washer SS

Dimensions

Dimensions (inch)				Flow Data
NPT A	B	C	D	Cv	Flow orifice inch	GPM*
1/2	2.50	1.88	7.50	1.98	.375	9.9
3/4	3.00	1.88	7.75	3.53	.50	17.6
1	4.00	2.13	12.00	7.95	.75	40
1-1/2	5.50	2.63	13.50	14.9	1.00	75
2	5.75	3.25	13.75	23.3	1.25	117

*Flow is in USGPM based on 25 PSI pressure drop

Note: Dimensions are approximate and are subject to change without notice. Request certified dimensions before final product installation.

To show prices: Click on a size:	1/2" PRS09i-P-05T	3/4" PRS09i-P-07T	1" PRS09i-P-10T	1-1/2" PRS09i-P-15T
	2" PRS09i-P-20T
To price or order, first select a size above.

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