High Pressure Flanged Pressure Regulator

PRH09i-300 FLG Stainless Steel 300# Flange High Pressure Regulator (Reducing Valve)

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Spring and piston operated
1/2"-3" Flanged (See model PRH09i for NPT versions)
Inlet pressures to 700 PSI (48.2) Bar)
Max operating temperatures up to 300 °F (148 °C)

Printable
Product Specs Instructions

PRH09i-300 FLG Stainless Steel 300# Flange High Pressure Regulator (Reducing Valve)

view prices order

Printable
Product Specs Instructions

View Pricing/Ordering Instructions

Spring and piston operated
1/2"-3" Flanged (See model PRH09i for NPT versions)
Inlet pressures to 700 PSI (48.2) Bar)
Max operating temperatures up to 300 °F (148 °C)

Dimensions/Material Item List

This is a direct-acting pressure-reducing regulator with an adjustable spring operating against a modulating piston that is subjected to the reduced outlet pressure of the valve.

This valve can be used for water, air, gases, chemicals, solvents, and other fluids. For optimal operation, only clean, filtered, or strained liquids and gases should be used. A strainer or filter, depending on the degree of contamination, should be installed before the inlet of the valve. Strainers and filters can be purchased from Stra-Val to provide some degree of protection.

Unlike unbalanced pressure-reducing valves, this valves feature a balanced inlet design. It performs well in applications where the inlet pressure fluctuates widely, having minimal effect on the outlet pressure.

This valve should not be used as a shutoff valve. If the valve is expected to be dead ended (i.e., no flow passing through the valve) for prolonged periods, the inlet pressure should be shut off, or a relief valve should be installed on the outlet side of the valve to prevent excessive pressure buildup.

You can customize your valve by selecting the valve size, spring range, and material options in the ordering section indicated in the dropdown menu. Soft seats are available for improved shutoff, especially for air or gas applications. Once these selections are made, a price quote can be generated and printed directly to your computer or emailed to you. If you wish to order the valve in exotic materials, you can request this directly through the website or send an email, and we will generate a customized quote for you.

303 or 316 stainless steel
1/2"-3" 300# FLG connections
Pressures to 700 PSI (48.2 Bar); temp to 300 °F (148 °C)
This valve can also be manufactured from exotic materials such as Monel 400, Hastelloy-C276, and Alloy 20.
Available with a metal-to-metal seat (ANSI IV) or a soft seat option.

This valve operates by balancing the spring force, set by the user, against the outlet pressure acting under the piston. There is an internal pressure-balancing port that subjects the outlet pressure directly to the underside of the large piston. When the outlet pressure falls below the set pressure required by the system, the spring force overcomes the force balance under the top piston. This causes the entire piston assembly to move down, opening the valve and allowing higher pressure from the valve’s inlet to pass through. When the outlet pressure rises to the desired level, the force balance is restored against the spring, and the valve moves toward the closed position.

The valve is fully self-regulating, and the piston constantly moves in response to pressure changes on the outlet side. The only time the piston closes completely is when the outlet pressure has reached its set point. If the valve can shut off properly without solids or other materials building up in the seat, or due to seat wear, the valve will maintain the outlet pressure and prevent it from rising above the set pressure.

If the valve is set with no flow passing through the system initially, there will be some droop (a drop in outlet pressure) caused by the relaxation of the spring when the valve first opens. This is typical for all direct-spring operated valves and can be compensated by making a slight adjustment to the set pressure once the desired capacity has been achieved.

Pressure Regulator

High Pressure

Model PRH09i-300#Flg
300# ANSI Flanged connections

Material List and Specification

Materials List (Metal Seat)
1	Set Screw	303SS or 316SS
2	Spring Chamber	303SS or 316SS
3	Pusher	303SS or 316SS
4	Adjusting spring	303SS or 316SS
5	Follower	Viton, EPDM, Buna
6	Top Piston	303SS or 316SS
7	Body	303SS or 316SS
8	O-ring	Viton, EPDM, Buna
9	O-ring	Viton, EPDM, Buna
10	Bottom Piston	303SS or 316SS
11	Adapter	303SS or 316SS
12	O-ring	Viton, EPDM, Buna
13	Bottom Plug	303SS or 316SS

Dimensions (inch)

A Connection Size 300# FLG	B	C	D
1/2”	6-1/2"	2-3/8"	10-1/2"
3/4"	6-3/4"	2-3/8"	10"
1”	8"	2-1/2"	10"
1 1/2"	9"	3"	12-1/4"
2”	9-1/2"	3-1/4"	13-1/2"
2 1/2"	10-3/4"	4"	18"
3”	11-7/8"	4-1/4"	18"

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

Pressure Regulator

High Pressure

Model PRH09i-300#Flg
300# ANSI Flanged connections

Material List and Specification

Materials List (Soft Seat)
1	Set Screw	303SS or 316SS
2	Spring Chamber	303SS or 316SS
3	Pusher	303SS or 316SS
4	Adjusting spring	303SS or 316SS
5	Follower	Viton, EPDM, Buna
6	Top Piston	303SS or 316SS
7	Body	303SS or 316SS
8	O-ring	Viton, EPDM, Buna
9	O-ring	Viton, EPDM, Buna
10	Bottom Piston	303SS or 316SS
11	Adapter	303SS or 316SS
12	O-ring	Viton, EPDM, Buna
13	Bottom Plug	303SS or 316SS
14	Seat Holder Screw	303SS or 316SS
15	Seat Holder	303SS or 316SS
16	O-ring	Viton, EPDM, Buna

Dimensions (inch)

A Connection Size 300# FLG	B	C	D
1/2”	6-1/2"	2-3/8"	10-1/2"
3/4"	6-3/4"	2-3/8"	10"
1”	8"	2-1/2"	10"
1 1/2"	9"	3"	12-1/4"
2”	9-1/2"	3-1/4"	13-1/2"
2 1/2"	10-3/4"	4"	18"
3”	11-7/8"	4-1/4"	18"

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

PRH09i-300 FLG Stainless Steel 300# Flange High Pressure Regulator (Reducing Valve)

PRH09i-300 FLG Stainless Steel 300# Flange High Pressure Regulator (Reducing Valve)

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Principle of Operation

Dimensions/Material Item List