Model PRH09

Pressure Regulator (Reducing Valve) 1500 psig (103 barg) Rating

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Spring and  double piston operated 1/2"-2" NPT THD Inlet pressures to 1500 PSI (103 Bar) Outlet pressures from 20 psig (1.4 barg) to 450 PSI (30 Bar) multiple spring ranges Max operating temperatures -40 to 300 °F (-40 to 150 °C) depending on elastomers selected

Features Pressure-containing parts made from solid bar stock materials — unlike castings which have wall thickness variations. Body and trim: Standard material is type 303 or 316 stainless steel. Special alloys (e.g. Hastelloy, Monel, titanium, and Alloy 20) also available. Elastomeric piston seals: Viton is standard. Alternates when specified are Buna, EPDM, Kalrez, and PTFE. Select PTFE seals only when required for chemical compatibility reasons as these seals create higher piston drag than the softer elastomeric seals. Spring chamber and adjusting spring: These parts are non-wetted, are not in contact with the fluid or gas, and are normally offered in carbon steel, painted for minimal exterior corrosion-resistant protection. When these parts are submerged or located in a corrosive atmosphere, they can be upgraded to a stainless steel or other corrosion-resistant materials at an additional cost. Standard porting: Right-angle porting, NPT threads (side inlet, bottom outlet). Valve works in any orientation, upright as illustrated, horizontal, etc. See also flanged model PRH-09-FLG. Optional porting: Side outlet (parallel port), or in-line porting can be supplied at additional cost when requested. Other options: Reduced trim for low-flow applications, locking cap. Contact factory

Applications

Designed for clean, filtered or strained, non-abrasive liquid service: oils, lubricants, greases, solvents, and most chemicals compatible with Viton seals seals. Valve is piston-operated, metal-seated with only the piston seals as elastomers. Do not use for extended shutoff service or for extremely low flows (less than 5% of maximum capacity). Values below the low limit of the spring ranges shown below can be achieved if the flow rates are substantially higher than the minimum 5% of maximum rated capacity. To be on the safe side, a relief or bypass valve should always be installed on the outlet side of the regulator (not included with valve). For outlet pressures above the ranges stated below, request the single piston model PRH04,  that is specifically designed to handle the higher outlet pressures that the PRH09 cannot handle. Do not use with liquids that tend to crystallize or solidify under operating conditions. Generally not for use on high pressure steam service as operating temperatures can easily exceed the limitations of the seal selections below. Consult factory for steam & gas service. Although the metal seat is standard, for gas service a soft seat such as Viton, Buna or EPDM or PTFE may be offered for improved shut off capability compared to a metal seat. But this depends on the operating conditions and is generally limited to lower pressure differences and not recommended for extreme pressure conditions. Consult factory.

The balanced piston design of this model accommodates large variations in inlet pressure. When ordered, if a set pressure is not specified, valves are set to the minimum pressure setting for the range selected. Valve can operate in any orientation: vertical, horizontal, etc. A high-pressure filter or strainer, which should be no coarser than #20 mesh, can be ordered from Stra-Val. See model SBS-10.

Options

• Reduced trim for low-flow applications, all sizes.
• Locking cap to enclose adjusting screw (1).
• Wetted materials (7,10) in type 316SS, Monel, titanium, and Hastelloy.
• Upgrade non-wetted spring chamber (2), spring hardware (3,5), and adjusting screw (1) to 300 series stainless steel.
• Hard-chromed piston (7) for longer life and seal (9) wear.

Principle of Operation

This valve operates with a compression spring acting on the main valve which is used to adjust the outlet pressure with an adjusting screw. The reduced outlet pressure is very easily adjusted in the field. To increase outlet pressure, simply loosen adjusting screw lock nut (2) to increase spring compression by turning the adjusting screw (1) inward. Similarly, to get a lowering in outlet pressure requires a reduction in spring compression by turning the screw outward. A pressure gauge is required on the outlet side of the regulator somewhere in the downstream piping about 10 pipe diameters after the valve, to monitor the result while making the adjustment. The valve will operate in a vertical orientation as illustrated, horizontal, or any other orientation.

Typical Illustration PRH09

PRH-09

Material List and Specification

1.	Adjusting screw	Steel or SS
3	Spring chamber	Steel or SS
4.	Spring pusher	Steel or SS
5.	Spring	Steel or SS
6.	Spring follower	Steel or SS
7.	Piston	Steel or SS
8.	Seal	Viton, Buna, EP or PTFE
9.	Seal	Viton, Buna,  EP or  PTFE
10.	Poppet	303SS or 316SS
10.	Body	303SS or 316SS

Dimensions (inches)

A NPT	B	C	D	E
1/2	1.75	1.00	1.00	10.7
3/4	1.75	1.00	1.00	11
1	2.63	1.38	1.38	13.6
1-1/4	2.75	2.50	1.50	13.8
1-1/2	3.00	2.75	1.50	14
2	3.5	2.88	1.63	15

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" PRH09-05T	3/4" PRH09-07T	1" PRH09-10T	1-1/4" PRH09-12T
	1-1/2" PRH09-15T	2" PRH09-20T	2-1/2" PRH09-25T	3" PRH09-30T
To price or order, first select a size above.

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