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281 PRI0 pages
P R O D U C T
D A T A
S H E E T
281 PRI®/CHEK® VALVE
The Lee Company’s new 281 PRI/Chek Valve
combines the function of a pressure relief valve
in parallel with a check valve into one easy to
install insert. The relief valve function features
a rugged Tungsten Carbide ball and a 440C
seat for durability and long life. The remaining
components are constructed entirely of stainless steel.
Offered with or without integral safety screens,
the 281 PRI/Chek Valve is available in a range
of relief flow cracking pressures for system
pressures up to 5000 psi. Maximum restriction
in the Free Flow Direction is only 300 Lohms*
(550 Lohms for screened version).
Each Lee PRI/Chek Valve is 100% tested and
inspected in both flow directions to ensure reliable, consistent performance.
■t Combines the function of a
pressure relief valve in
parallel with a check valve
■t Durable tungsten carbide
t ball and a 440C seat
■t Screened version available
■t Designed for system
pressures up to 5000 psi
■t Weighs only 8 grams
(9 grams for screened version)
■t Endurance tested to 100,000 relief flow and 500,000 free flow cycles
.281 PRI /Chek Valve
tPINt
INSTALLATION HOLE
INSERT
Relief Flow Direction
Free Flow Direction
Screened .281 PRI /Chek Valve
tPINt
INSERT
INSTALLATION HOLE
Relief Flow Direction
Free Flow Direction
MATERIALS
PART
SPECIFICATION
303 CRES
QQ-S-763C
Seat
440C CRES
AMS 5630
Spring Seat
303 CRES
QQ-S-763C
Springs
INSTALLATION AND EXTRACTION
MATERIAL
Shuttle Plate
17-7PH CRES
AMS 5678
* The Lohm is a measure of flow resistance.
Additional information can be found at
www.TheLeeCo.com.
15-5PH CRES
AMS 5659
303 CRES
QQ-S-763C
Tube
17-4PH CRES or 304 CRES
AMS 5643, AMS 5639
Ball
Tool Set Part No.: CUTA2810114C
Replacement Pin Part No.: SHBA2810003A
Body
Ball Follower
Tungsten Carbide
–
Pin
15-5PH CRES
AMS 5659
Screens
15-5PH CRES
AMS 5659
The Lee Company, 2 Pettipaug Rd., P.O. Box 424, Westbrook, CT 06498-0424
PDS 118 1/13
Tel: 860-399-6281
Fax, Order Entry: 860-399-7058
Fax, Technical Information: 860-399-7037
Web: www.TheLeeCo.com
