Phone (toll-free): (888) 380-9660 20 Bushes Lane

Phone (local): (973) 340-9955 Elmwood Park, NJ 07407

Fax: (973) 340-9933
Web: www.straval.com

Model PRH04-600 FLG

High Pressure Regulator (Reducing Valve)

600# ANSI Flanged Regulators

● Spring and piston operated

 ● 1/2"-2" Flanged (See model PRH04-Thd for Npt versions)
● Inlet pressures to 1400 PSI (96.5 Bar)
● Outlet pressures to 1400 PSI (96.5 Bar) (multiple spring ranges; see table below)
● Max operating temperatures -40 to 400 °F (-40 to 204 °C)

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.
● Teflon PTFE V packing seals: High-pressure, low-friction, self-expanding design permits operation with small differences
between inlet and outlet pressures as low as 50-75 PSI (approx), as long as the packing nut is not overtightened and
piston surfaces are kept clean.
● 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. The spring chamber is not offered in aluminum or plastic.
● Standard porting: Right-angle porting, NPT threads (side inlet, bottom outlet). Valve works in any orientation, upright as
illustrated, horizontal, etc. See also threaded model PRH-04-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, inlet or outlet pressure gauge ports,

Applications

Designed for clean, filtered or strained, non-abrasive liquid service: oils, lubricants, greases, solvents, and most non-fluorinated
chemicals compatible with Teflon PTFE seals. Valve is piston-operated, metal-seated without any elastomers. Do not use for
extended shutoff service or for extremely low flows (less than 5% of maximum capacity, approximately). 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 below the ranges stated below, request model PRH09-FLG double
piston model, that is specifically designed to handle the lower outlet pressures that the PRH04-FLG cannot handle. Do not use
with liquids that tend to crystallize or solidify under operating conditions. Not for use on steam service as operating temperatures
can easily exceed the limitations of the Teflon seals which are rated for 400 Deg F max. Consult factory for steam & gas service.
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 #60 mesh, can be ordered from
Stra-Val. See model SBS-10.

We now offer some models that meet NACE MR0175. These are not priced on line. Consult factory.

Options

● Reduced trim for low-flow applications, all sizes.

● Locking cap to enclose adjusting screw (1).
● Wetted materials (7,8 & 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.
● Custom seal materials for special applications where PTFE seals (9) may not be suitable.

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 close to 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.
 Pressure Regulator

High Pressure

Model PRH-04-600#Flg
600# ANSI Flanged connections

Material List and Specification

1. Adjusting screw Steel or SS
2. Spring chamber Steel or SS
3. Spring pusher Steel or SS
4. Spring Steel (Coated)
5. Screw Steel or SS
6. Spring follower Steel or SS
7. Piston 303SS or 316SS
8. Packing nut 303SS or 316SS
9. Packing rings Teflon (PTFE)
10. Body 303SS or 316SS

Dimensions (inch)
A
B C D E
FLG
1/2 1 1 1-7/8 11-1/2
3/4 1-1/4 1-1/4 2-1/4 12
1 1-1/2 1-1/2 2-5/8 14
1-1/4 2 3/16 1-1/2 2-1/2 14
1-1/2 2-1/2 1-1/2 3 14-1/2
2 2-1/2 1-1/2 4 16-1/2

Note: Dimensions are approximate and are subject to change without notice. Request certified dimensions before final product
installation.
 1/2" PRH04-05C
Max Inlet pressure 1400 psig (96.5 barg)
Multiple Spring Ranges from:150-1300 psig (10.3-89.7 barg) Select spring from pricing page

3/4" PRH04-07C
Max Inlet pressure 1400 psig (96.5 barg)
Multiple Spring Ranges from:150-1300 psig (10.3-89.7 barg) Select spring from pricing page

1" PRH04-10C
Max Inlet pressure 1400 psig (96.5 barg)
Multiple Spring Ranges from:150-1200 psig (10.3-82.8 barg) Select spring from pricing page

1-1/2" PRH04-15C
Max Inlet pressure 1400 psig (96.5 barg)
Multiple Spring Ranges from:150-1200 psig (10.3-82.8 barg) Select spring from pricing page

2" PRH04-20c
Max Inlet pressure 1400 psig (96.5 barg)
Multiple Spring Ranges from:150-1200 psig (10.3-82.8 barg) Select spring from pricing page

3" PRH04-30C
Max Inlet pressure 1300 psig (89.7 barg)
Multiple Spring Ranges from:150-1000 psig (10.3-69 barg) Select spring from pricing page

6" PRH04-60C
Max Inlet pressure 1400 psig (96.5 barg)
Multiple Spring Ranges from:150-1000 psig (10.3-69 barg) Select spring from pricing page

4" PRH04-40C
Max Inlet pressure 1400 psig (96.5 barg)
Multiple Spring Ranges from:150-1000 psig (10.3-69 barg) Select spring from pricing page

The spring ranges listed above are not achievable with one spring, but are compressed to show overall product capability.
Select a specific spring range in the pricing pages or specify a set pressure when ordering.

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