Samson 45-9 Mounting And Operating Instructions page 16

Design and principle of operation
The minimum required differential pressure
Δp across the valve is calculated as follows:
min
Δp Minimum differential pressure in bar across the valve
min
Δp Differential pressure created at the restriction for measuring the flow rate
restriction
·
Adjusted flow rate in m³/h
V
K Valve flow coefficient in m³/h
VS
Table 2: Materials
Body
Seat
PN 25
Plug
PN 16
PN 25
Diaphragm
case
PN 16
Valve spring
Restriction
Operating diaphragm
Seals
Additional version in DN 32, 40 and 50: valve with flanged body made of spheroidal graphite
1)
iron
Special version in PN 25, e.g. for mineral oils: FKM
2)
16
Red brass CC499K (Rg 5) · Spheroidal graphite iron EN-GJS-400-18-LT
Brass (resistant to dezincification) with EPDM
Brass, resistant to dezincification and plastic with EPDM soft seal
Red brass CC499K (Rg 5) · Spheroidal graphite iron EN-GJS-400-18-LT
EPDM
Δp
min
Stainless steel 1.4305
Stainless steel 1.4301
Stainless steel 1.4310
Brass, free of dezincification
with fabric reinforcement
2)
EPDM
2)
·
(
V
= Δp +
restriction
K
VS
soft seal
2)
EB 3128 EN
2
)
1)
1)