Regulator ensures that pressure will be balanced across a bank of filters or similar equipment

PRD Differential Pressure Regulators

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Series PRD for maintaining pressure settings across a filter bank or similar equipment

Series PRD for maintaining pressure settings across a filter bank or similar equipment

Pressure Regulator Basics:
Plastic pressure regulators are multi-functional, normally-open valves for controlling downstream pressure, enhancing system performance, and balancing pressure in a process system. They are used to reduce excessive or fluctuating inlet pressures to a safe, predetermined downstream pressure.

Differential Pressure Regulators balance inlet and outlet pressure across a series of filters or other sensitive components.

Design & Features of Series PRD:
Series PRD is a differential pressure regulator based on Series PR with two threaded ports. One port is for a downstream pressure sensing line, the other is fitted with a bleed screw to exhaust air from the housing. Otherwise, design is identical to Series PR. The sensing line feeds the pressure downstream (P3) of the equipment being protected to the top of the spring housing (also P3). This pressure assists the spring in keeping the regulator open against the pressure directly at the regulator outlet (P2). When pressure downstream begins to drop (as it would when a filter becomes more and more clogged), the regulator begins to close and becomes fully closed when the differential setting is reached. This assures against overpressure across the bank of filters or whatever the equipment may be. The differential pressure setting is P2 minus P3.

• Pressure setting is infinitely adjustable from 5 psi to 50 psi.
• Maximum inlet pressure is 150 psi.
• Available in Grade 1, Type 1 Geon® PVC
• Sizes 1/4", 1/2", 3/4", 1", 1-1/2", 2" & 3".
• Installs easily; common tubing is used to connect to desired point downstream.
• Spring is fluoropolymer coated since downstream liquid is in contact.
• Seals in EPDM or Viton.
• High performance, heavy-duty design.

Flow Capacity vs. Pressure Drop Reference Chart:

Series PR & PRD FLOW CAPACITY vs. PRESSURE DROP REFERENCE CHART
1/4		1/2		3/4		1		1 1/2		2		3
FLOW GPM	* PSI	FLOW GPM	* PSI	FLOW GPM	* PSI	FLOW GPM	* PSI	FLOW GPM	* PSI	FLOW GPM	* PSI	FLOW GPM	* PSI
1	4	1½	4	8	4	11	4½	16	5	20	5	50	6
3	7	2½	5	14	6½	20	7	28	7½	40	8	100	9
4	12	6	6½	25	10	25	11	36	12	60	12	130	11
4½	16	7	9	29	12	40	13	58	14	80	14	160	13
5	18	10	13	35	14	50	15	70	16	100	16	200	16
*Pressure Drop () is measured from set pressure of regulators

NOTE: The generally accepted safe velocity in plastic piping is 5 feet per second. The above flows go beyond this rate.

Series PR & PRD Pressure Regulator Dimensions:

		SIZE NPT or BSP
DIM.		1/4	1/2	3/4	1	1 1/2	2	3
A	in. mm.	2 50.8	2-1/2 63.5	2-7/8 73	2-7/8 73	2-7/8 73	2-7/8 73	5-1/4 133.4
B	in. mm.	1-3/8 34.9	1 3/4 44.4	2-1/2 63.5	2-1/2 63.5	2-1/2 63.5	2-1/2 63.5	4 101.6
C	in. mm.	4-1/4 108	4 101.6	7-1/2 195.0	7-1/2 195.0	8 203.2	9-3/4 238.1	11-3/4 295.3
D	in. mm.	1-1/4 31.8	1 3/4 44.4	2-1/4 57.1	2-1/2 57.1	2-3/4 69.9	5-1/8 130.2	6-3/4 161.9
E	in. mm.	2 50.8	2 1/2 63.5	4-1/2 114.2	4-1/2 114.2	5 127	7 177.8	8-5/8 219.1

Series PR & PRD Regulator Part Numbers:

PIPE SIZE	SERIES PR		SERIES PRD
PIPE SIZE	EPDM Seals	Viton Seals	EPDM Seals	Viton Seals
1/4	PR025EP	PR025V	PRD025EP	PRD025V
1/2	PRM050EP	PRM050V	PRD050EP	PRD050V
3/4	PR075EP	PR075V	PRD075EP	PRD075V
1	PR100EP	PR100V	PRD100EP	PRD100V
1 1/2	PR150EP	PR150V	PRD150EP	PRD150V
2	PR200EP	PR200V	PRD200EP	PRD200V
3	PR300EP	PR300V	PRD300EP	PRD300V

Plast-O-Matic regulators deliver higher flow and much less drop-off from set pressure than other typical pressure regulators. Operation is smooth, sensitive and extremely accurate.

ORDERING INFORMATION:

PRD 075 V - PV
BSP Threads	Seals	Body Material (See Note)
025 (¼ in.); 12mm	EP-EPDM	PV-PVC
050 (½ in.); 20mm	V-Viton
075 (¾ in.); 25mm
100 (1 in.); 32mm
150 (1-½ in.); 50mm
200 (2 in.); 63mm
300 (3 in.); 90mm

Note: For alternate materials consult factory. Minimum quantities apply. Spring housing may be PVC material for lower cost.

For complete information request Catalog PRD

Helpful Links:
General Pressure Regulator Index Page
Descriptions and links to the complete line of Plast-O-Matic Pressure Regulators.
(May be the page you linked from)

Backpressure Regulators
If you are looking to regulate backpressure, or pressure "upstream" of the valve, you need a backpressure regulator instead of a pressure regulator.

Flow Control ValvesIf you are really trying to control your flow rate, as opposed to pressure, Plast-O-Matic provides a highly effective constant flow rate valve.

Series PRA Air-Loaded Pressure Regulator
If you need a pressure regulator with a little more versatility, Series PRA is the best place to start. It uses common compressed air in place of a spring. An optional device, the Series PRS Stabilizer, can be used to provide zero drop-off performance. In addition, Series PRA can be used with an appropriate sensor and E:P controller to regulate many other system parameters, including temperature, flow rate, pH, and more.

Plast-O-Matic Valves, Inc.
1384 Pompton Avenue
Cedar Grove, NJ 07009 USA
Voice: (973) 256-3000
Fax: (973) 256-4745

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