Specifications
This section lists the specifications for the Type N6 differential pressure valves. Factory specifications are
stamped on the nameplate fastened on the valve at the factory.
Rated
Flow Coefficient
See Table 1
Materials of Construction
Body:
Cast iron
Stem, Disk, Seat Ring, Piston and Spring:
Stainless steel
Sealing Ring:
Fluorocarbon (FKM)
Gasket:
Graphite
Approximate Weight
See Table 2
Valve Sizes
NPS 3/4, 1, 1-1/4, 1-1/2, 2 and 2-1/2 /
DN 20, 25, 32, 40, 50 and 65
End Connection Styles
NPT and CL250
Pressure Rating
(1)
250 psig / 17.2 bar
Temperature Rating
(1)
350°F / 177°C
Spring Ranges
5 to 50 psid / 0.34 to 3.4 bar d
40 to 125 psid / 2.76 to 8.62 bar d
100 to 200 psid / 6.89 to 13.8 bar d
1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
Table 1.
Type N6 Differential Pressure Valve Rated Flow Coefficients
BODY SIZE
FLOW COEFFICIENTS (C
V
)
NPS
DN
3/4
20
7.1
1
25
13.3
1-1/4
32
22.0
1-1/2
40
32.5
2
50
51.0
2-1/2
65
88.0
Table 2.
Type N6 Differential Pressure Valve Approximate Weight
BODY SIZE
APPROXIMATE WEIGHT
NPS
DN
lbs
kg
3/4
20
10
4.5
1
25
12
5.5
1-1/4
32
19
8.6
1-1/2
40
26
12
2
50
39
18
2-1/2
65
74
34
2
Type N6
