Model PRS-05-1

In-Line Pressure Regulator (Reducing Valve)

Printable Product Specs PDF Instructions Pricing

Spring-diaphragm operated 1/8"-1" NPT THD Inlet pressures to 300 PSI (~20 Bar), Body rated to 1500 psi (~100 bar) Outlet pressures to 125 PSI (8.5 Bar) (multiple spring ranges)

Features Pressure-containing parts made from solid bar stock materials — unlike castings which have wall thickness variations. Body: Standard materials are stainless steel, steel, and brass. Special alloys (e.g. Monel, titanium, Hastelloy, and Teflon) also available. Trim: Stainless steel for valve seat holder, diaphragm, and internal valve spring is standard. Replaceable seat is Teflon. Metal diaphragm seal permits valve to operate at cryogenic and elevated temperatures to 450 °F (232 °C) when seat is Teflon, and to 600 °F (315 °C) when ordered as model PRS-05 without the Teflon seat. See separate web page. In-line porting allows for simplified piping installation.

Applications

One would select this model where a soft seat is desrired especially  for air or gas service, or where tighter shutoff is required on liquid service. However, one should not expect to use this as a shut off valve. Seat leakage criteria will be to ANSI class V leakage standards, so a relief valve is still always recommended on the outlet of the valve to at least handle any pressure buildup that may occur just from seat leakage that could occur from seat wear, corrosion, or just dirt contamination trapped in the seat. A relief valve would compensate for pressure spikes in the piping system or some mechanical failure in the pressure regulator caused by external circumstances.

Valve can be used for non-corrosive or mildly corrosive fluids, depending on the materials selected (consult factory). When liquids or gases contain debris or other solid matter which might cause internal clogging or improper operation of the valve, a strainer with a fine wire mesh should be installed before the inlet of the valve. In-line strainer fittings STF-05 or basket strainer models SBS-10 or SBV-05 can be purchased from Stra-Val to solve this problem.

This valve will work quite well on applications where the inlet pressure will not fluctuate widely. However, where the condition does exist and the outlet pressure needs to be controlled closely below 80 psi, a pressure-reducing valve with a balanced design is recommended such as the Stra-Val model PRS-09. Although the body has a high pressure rating, inlet pressures above 300 psi (~20 bar) are not recommended, especially when outlet pressures below 15 psi (~1 bar) need to be controlled.  Even though the body is rated to pressures up to 1500 psi (~100 bar), permanent deformation to the diaphragm and seat may occur if the seat is unable to shut off properly and will require replacement under these extreme conditions.  For higher inlet pressures see our high pressure models PRH04 and PRH09

Options

Principle of Operation

This is a direct-acting pressure-reducing valve with an adjustable spring operating against a flexible stainless steel diaphragm subjected to the reduced outlet pressure of the valve. With the spring completely uncompressed and adjusting screw backed out, the inlet pressure will close the main valve and keep it shut. This will shut off flow and reduce the outlet pressure to zero if the valve seat is sealing effectively.

Customized Pricing & Ordering Information ($USD)

To show prices: Click on a size:	1/4" PRS05-02T-1	3/8" PRS05-03T-1	1/2" PRS05-05T-1	3/4" PRS05-07T-1
	1" PRS05-10T-1
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