An automatic, pilot controlled, pressure relief valve, actuated by the pipeline pressure. The valve modulates to maintain a steady, predetermined pressure in the network. Should the upstream pressure exceed the required set point, the valve opens, releasing the excessive pressure. When the pressure falls below the set value, the valve closes drip tight.
Size Unit
Size range
Fire Protection certifications
UL Listed
Model 44 (Threaded): DN50-80 / 2”-3”
Model 77 (Flanged): DN80-200 / 3”-8”
Pressure rating
Working temperature
End connection type
Flanged
ISO-PN16 & ISO-PN25
ASME/ANSI B16.42 & B16.5 Class 150# & Class 300#
Grooved
ASME/ANSI AWWA 606
Sizes: 2″-8″
Threaded
Sizes: 1″-3″
Materials of construction
Body and Cover
Ductile Iron ASTM A536
Stainless Steel ASTM CF8M
Cast Steel ASTM A216 & A352 LCB
NAB ASTM B148 C-958000
Internal Parts
Stainless Steel
Diaphragm
Neoprene (standard)
NR
NBR
EPDM
Control Trim & Accessories
Brass / Bronze / Copper (standard)
Stainless Steel
Super Duplex
Monel
NAB
* Other optional materials available upon request
OCV 44, 68 ,77 PS\UL
OCV 68 PS\UL
OCV 77 PS\UL
