375 PRI®/CHEK® VALVE0 pages
PRODUCT DATA SHEET
nnnnInnovation in Miniature
nnnn375 PRI®/CHEK® VALVE
nnnnThe Lee Company's new 375 PRI/Chek
nnnnValve combines the function of a pres-
nnnnsure relief valve in parallel with a check
nnnnvalve into one easy to install insert. The
nnnnrelief valve function features a rugged
nnnnTungsten Carbide ball and a 440C
nnnnseat for durability and long life. The re-
nnnnmaining components are constructed
nnnnentirely of stainless steel.
nnnnThe 375 PRI/Chek Valve is available
nnnnin a range of relief flow cracking pres-
nnnnsures for system pressures up to
nnnn5000 psi. Maximum restriction in the
nnnnfree flow direction is only 220 Lohms
nnnn(see reverse page for an explanation
nnnnof Lohms).
nnnnEach Lee PRI/Chek Valve is 100%
nnnntested and inspected in both flow di-
nnnnrections to ensure reliable, consistent
nnnnperformance.
nnnnRelief Flow Direction
nnnnFree Flow Direction
nnnnMATERIAL | 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 |
Finish: All CRES Parts Passivateci.
nnnnPins are prewaxed. Do not degrease. Do not lubricate.
nnnnCombines the function of a
nnnnpressure relief valve in parallel
nnnnwith a check valve.
nnnnDurable tungsten carbide ball and
nnnna 440C Cres seat.
nnnnDesigned for system pressures
nnnnup to 5,000 psi
nnnnWeighs only 24 grams
nnnnEndurance tested to 100,000 relief
nnnnflow and 500,000 free flow cycles
nnnnPIN
nnnnI | . 39 |
. 34 |
3749
nnnn3742
nnnnINSERT
nnnn— 2. 26 —
nnnn3755
nnnn3750
nnnnINSTALLATION HOLE
nnnn-2.28 MIN —
nnnn-S-
nnnnH K- . 14 MIN
nnnn16-
nnnn. 003_
nnnnMAX
nnnn45
nnnn335
nnnn265
nnnn0.003
nnnnLEE | 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 |
PERFORMANCE
nnnnRelief Flow Direction:
nnnnLeakage at Minimum Cracking Pressure:
nnnnLeakage at Minimum Shutoff Pressure:
nnnnRestriction at Minimum Recommended Valve Lift:
nnnnNominal System Pressure:
nnnnSystem Peak Pressure:
nnnnNominal Weight:
nnnn2 mL/min maximum
nnnn2 mL/min maximum
nnnn1500 Lohms
nnnnUp to 5000 psi
nnnn6750 psi maximum
nnnn24 grams
nnnnValve performance on MIL-PRF-83282 or MIL-PRF-5606 at 85°F±15°F.
nnnnTHE LEE COMPANY, 2 PETTIPAUG RD., P.O. BOX 424, WESTBROOK, CT 06498-0424
nnnnPDS 117 2/12
nnnnTel: 860-399-6281
nnnnFax, Order Entry: 860-399-7058
nnnnFax, Technical Information: 860-399-7037
nnnnWeb: www.TheLeeCo.com
"