Page 187 - Bürkert

2/2-way Diaphragm Valve, Classic, pneumatically operated,
forged valve body

2031 DN8-100 mm

• Hermetical separation of fluids from the
operating mechanism by diaphragm
• Zero dead volume
• Various surface finishes available

2 (A)

1 (P)

The externally piloted diaphragm valve consists of a pneumatically oper- Dimensions [mm] (see datasheet for further Details)
ated piston actuator, a diaphragm and a 2-way valve housing made of
forged stainless steel. The standard material of the actuator is PPS. The
B
flow optimised and zero dead volume valve body makes high flow rates Pilot air port
possible and a variety of applications to be realised. Actuator 40 & 50 = 1/8”
Actuator 63-225 = 1/4”
Technical data
Orifice DN8-100 mm
Body material Forged stainless steel 316L/1.4435 / BN2
Fe < 0.5% / C ≤ 0.03% C
Pilot air ports Stainless steel 1.4305
Seal materials EPDM, PTFE/EPDM
(advanced PTFE/EPDM on request)
Medium temperatures
EPDM, PTFE/EPDM, ad- -10 ºC to +130 ºC A
vanced PTFE/EPDM (Briefly up to +150 °C for steam sterilisation) DN Actuator A B C
Actuator materials PPS for actuator size ≥ 40-125 mm 8 40 90 53 85
PA polyamide for actuator size ≥ 175 mm 10 40 90 53 85
Media Neutral gases and liquids, high purity, aseptic, 15 50 110 64 118
aggressive or abrasive fluids 20 63 119 80 146
Control medium Neutral gases; air 25 80 129 101 175
Ambient temperature 32 100 161 127 233
Actuator size < 100 mm +5 °C to +140 °C
Actuator size 100-125 mm +5 °C to +90 °C, briefly up to 140 °C 40 100 161 127 233
Actuator size >125 mm -10 °C to +50 °C 50 125 192 153 277
Port connections 65 225 250 261 394
Weld end body acc. to EN ISO 1127/ISO 4200, DIN 11850 S2 80 225 250 261 394
Viscosity Up to viscous 100 225 250 261 409

Options
• Seal material FKM
• Feedback
• Stroke limitation

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