375 PRI®/CHEK® VALVE0 pages

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PRODUCT DATA SHEET

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Innovation in Miniature

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375 PRI®/CHEK® VALVE

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The Lee Company's new 375 PRI/Chek

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Valve combines the function of a pres-

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sure relief valve in parallel with a check

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valve into one easy to install insert. The

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relief valve function features a rugged

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Tungsten Carbide ball and a 440C

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seat for durability and long life. The re-

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maining components are constructed

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entirely of stainless steel.

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The 375 PRI/Chek Valve is available

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in a range of relief flow cracking pres-

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sures for system pressures up to

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5000 psi. Maximum restriction in the

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free flow direction is only 220 Lohms

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(see reverse page for an explanation

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of Lohms).

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Each Lee PRI/Chek Valve is 100%

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tested and inspected in both flow di-

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rections to ensure reliable, consistent

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performance.

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Relief Flow Direction

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Free Flow Direction

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	MATERIAL	SPECIFICATION
Shuttle Plate	304 CRES	AMS 5639
Seat	440C CRES	AMS 5630
Spring Seat	15-5PH CRES	AMS 5659
Springs	17-7PH CRES	AMS 5678
Retainer	15-5PH CRES	AMS 5659
Shim	17-7PH CRES	AMS 5529
Body	304 CRES	AMS 5639
Ball Follower	304 CRES	AMS 5639
Tube	13-8 MO CRES	AMS 5629
Ball	Tungsten Carbide
Orifice Plate	304 CRES	AMS 5639
Pin	17-4PH CRES	AMS 5643

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Finish: All CRES Parts Passivateci.

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Pins are prewaxed. Do not degrease. Do not lubricate.

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Combines the function of a

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pressure relief valve in parallel

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with a check valve.

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Durable tungsten carbide ball and

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a 440C Cres seat.

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Designed for system pressures

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up to 5,000 psi

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Weighs only 24 grams

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Endurance tested to 100,000 relief

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flow and 500,000 free flow cycles

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PIN

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I	. 39
. 34

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3749

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3742

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INSERT

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— 2. 26 —

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3755

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3750

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INSTALLATION HOLE

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-2.28 MIN —

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-S-

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H K- . 14 MIN

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16-

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. 003_

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MAX

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45

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335

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265

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0.003

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LEE	RELIEF FLOW DIRECTION					FREE FLOW DIRECTION
	MINIMUM	FLOW POINT			MINIMUM SHUTOFF PRESSURE (psid)	CRACKING PRESSURE (psid)	LOHM RATE AT 25 PSID AND GREATER
PART NUMBER	CRACKING PRESSURE (psid)	LOHM RATE	MIN. FLOW (gpm)	AT (psid)
PFRA3750300D	3000	400	3.7	3850	2850	5 ± 3	220 max
PFRA3750320D	3200	400	3.8	4050	3000	5 ± 3	220 max
PFRA3750340D	3400	400	3.9	4250	3200	5 ±3	220 max
PFRA3750420D	4200	400	4.0	5250	4000	5 ±3	220 max
PFRA3750440D	4400	400	4.1	5400	4200	5 ±3	220 max
PFRA3750520D	5200	400	4.9	6550	5000	5 ±3	220 max
PFRA3750540D	5400	400	5.0	6750	5200	5 ±3	220 max

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PERFORMANCE

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Relief Flow Direction:

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Leakage at Minimum Cracking Pressure:

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Leakage at Minimum Shutoff Pressure:

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Restriction at Minimum Recommended Valve Lift:

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Nominal System Pressure:

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System Peak Pressure:

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Nominal Weight:

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2 mL/min maximum

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2 mL/min maximum

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1500 Lohms

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Up to 5000 psi

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6750 psi maximum

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24 grams

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Valve performance on MIL-PRF-83282 or MIL-PRF-5606 at 85°F±15°F.

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THE LEE COMPANY, 2 PETTIPAUG RD., P.O. BOX 424, WESTBROOK, CT 06498-0424

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PDS 117 2/12

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Tel: 860-399-6281

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Fax, Order Entry: 860-399-7058

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Fax, Technical Information: 860-399-7037

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Web: www.TheLeeCo.com

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