57
Dixon Sanitary 2014
800.789.1718
Diaphragm Valves
Clamp Dimensions and C
v
Factors
Clamps
The clamp connection is the most popular connection for easy
assembly and breakdown of process lines and valves. The
clamp end connection is designed for a face-to-face joint that
is leak proof and free of crevices.
The clamp end has a machined beveled seat and is used with
specifically formed sealing gaskets made of EPDM or PTFE.
The gasket is inserted between the opposing clamp ends and
is compressed tight with a wing nut quick disconnect clamp.
In general, the valve clamp ends are welded to the valve butt
weld ends and polished according to the specified interior
valve body surface finish.
The welded clamp ends are 100% visually inspected and
compression tested. The clamp connections are available for
all current pipe standard diameters.
If the connecting clamp ends are not identical and of the same
diameter standard, there may result a reduction or step in the
process piping system or the ability of self draining ends is not
guaranteed.
If assembled correctly, the clamp end process system offers
a smooth, crevice-free, self-aligning joint that reduces the
hazards of contamination but minimizes turbulence and
pressure drop through the system.
C
v
Factor
In order to design valves for a process system correctly, the valve size is determined by the required flow rate. The C
v
value is
stated in the following table with regard to the nominal diameter. The C
v
value is a parameter defining the flow rate in gallons per
minute of water from 41-85°F which flows through the valve at a pressure loss of 1 PSI. This applies when the valve is 100%
open.
Valve Size
C
v
Value
Valve Type
1/4"
0.8
Bio Series
3/8"
1.6
1/2"
2.3
1/2"
2.6
Standard Fractional
3/4"
5.4
1"
14.0
Standard
1-1/2"
46.8
2"
56.2
2-1/2"
99.5
3"
128.7
4"
216.5
Valve
Size
ASME BPE
ASME BPE DT-V-1
L
3
b
2
b
1
1/4"
2.5
0.18
0.992
Bio
Series
3/8"
2.5
0.31
0.992
1/2"
2.5
0.37
0.992
3/8"
---
---
---
Standard
Fractional
1/2"
3.5
0.37
0.992
3/4"
4.0
0.62
0.992
1/2"
4.0
0.37
0.992
Standard
3/4"
4.0
0.62
0.992
1"
4.5
0.87
1.984
1-1/4"
---
---
---
1-1/2"
5.5
1.37
1.984
2"
6.25
1.87
2.516
2-1/2"
8.75 *
2.37
3.047
3"
8.75
2.87
3.579
4"
11.5
3.83
4.682
*
length differing from standard; other lengths available on
request
b
2
b
1
L
3
F