Steriflow Mark 968 Series - Manual (Page 7)

Mark 968 Series
Sanitary Gas Regulator (1-1/2" – 2")
The 1-1/2" and 2" valves are for use on large tank
blanketing applications or other low pressure gas
regulation. In a tank blanketing application, the
Mark 968 is used to control the flow of the blanket-
ing gas into the tank to maintain the proper positive
pressure. Once the blanket has been established,
a small flow of nitrogen is continually admitted to
the tank to keep the blanket fresh. These valves are
often used in conjunction with the Mark 958 back
pressure gas regulator, used to vent gas from the
tank to prevent blanketing pressure from rising to a
level that could damage the tank.
The Mark 968 comes standard with an extra large
diaphragm to give set point control as low as 2.0"
W.C. (4,98 mbar). In addition, the "S" pattern body
design allows for high flow capacity and bubble
tight shutoff.
s
peciFications
Line Sizes: 1-1/2" (DN40), 2" (DN50)
End Connections
• Clamp — ISO, DIN, Tri-Clamp
• Flanged — 150#, 300#, Sanitary
• Others upon request
Materials
• Body: Stainless Steel (SA351/CF8M)
• Trim: 316/316L Stainless Steel
• Seat: 316/316L Stainless Steel with Viton (FDA)
• Diaphragm: Viton (FDA)
Shutoff: ANSI Class VI
Ranges:
• 2 to 5 inches w.c. (4,98 to 12,5 mbar)
• 4 to 8 inches w.c. (9,96 to 19,93 mbar)
• 8 to 28 inches w.c. (19,93 to 69,75 mbar)
• 10 to 17 inches w.c. (24,91 to 42,35 mbar)
• 14 to 28 inches w.c. (34,87 to 69,75 mbar)
• 0.75 to 1 psi (51,71 to 68,95 mbar)
• 1 to 2 psi (68,95 to 137,90 mbar)
• 1.5 to 3 psi (0,10 to 0,21 bar)
• 3 to 5 psi (0,21 to 0,34 bar)
Cv Rating: 23 (20 Kv)
Pressure Temperature Rating: 25 psi @ 100°F (1,72 bar @
27,8 °C), 25 psi @ 275°F (1,72 bar @ 135°C)
Maximum Pressure Drop: 25 psig (1,72 bar)
d
iMensions
Valve
Size
Dimensions, Inches
A B C D
1-1/2" 8.75 4.93 12.32 15.00
2" 8.75 4.93 12.32 15.00
A
C
B
D
3/4" FNPT
Sensing Port
Flow
15.0
(381)
4.75
(120,7)
3/4" FNPT Sensing Tap (Bottom)
3/4" FNPT Vent (Top)
Flow
Valve
Size
Dimensions, Inches
A B C D
DN40 222,3 125,2 312,9 381,0
DN50 222,3 125,2 312,9 381,0
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