SR 4 Heavy duty, high pressure piston. Ideally suited pressure vessel and dead-end testing. Delivery pressure up to 4500 psig on some models.
 
Design/Construction
Machined brass body & housing cap
2.5" (63.5 mm) gauges - brass
Cartridge type seat assembly with PCTEF seat
Piston type actuation - brass
Delrin cap bushing for smooth adjustments 
External adjustable relief valves on F and G range models
Hydrogen models have vantable relief valves (L series does not)
Sintered inlet filter : bronze
 
Dimensions
W x H x D : 6" x 6.5" x 6.25" (152.4 mm x 165.1 mm x 158.8 mm)
 
Weight 
4 lb (1.81 kg)
 
Performance
Maximum inlet 
               - 7500 psig with CGA 677
               - 6000 psig without inlet fitting
               - 5500 psig with CGA 701, 680, 347
               - 4000 psig with CGA 577
               - 3000 psig CGA 540, 580, 346, 350