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Construction
The GEMU 618 motorized metal diaphragm valve has a low maintenance electric actuator and a reversible synchronous motor. It is operated via a reduction gear and cam. An integrated optical position indicator is standard.
GEMU 618 is also available without a stainless steel distance piece for applications with lower operating temperatures.

Features
  • Suitable for inert and corrosive liquid and gaseous media
  • The motor will withstand being stalled under full voltage
  • Valve body and diaphragm available in various materials and designs
  • Suitable for use as a control valve (with integrated control module)
  • Insensitive to particulate media
Advantages
  • Direct 0/4 - 20 mA signal processing with control module
  • Opening and closing behaviour is independent of the media line pressure
  • Hermetic sealing
  • Optional flow direction, will seal in either flow direction up to full operating pressure
  • Optional mounting position

Specifications

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Type 618
Nominal Size DN 004 DN 006 DN 008 DN 010 DN 015 DN 10 DN 12 DN 15 DN 20
Body Configuration 2/2-Way Multi-Port Design T body Tank valve body
Connection Butt Weld Spigots ASME BPE Butt Weld Spigots BS 4825, Part 1 Butt Weld Spigots DIN Butt Weld Spigots DIN 11850, Series 1 Butt Weld Spigots DIN 11850, Series 2 Butt Weld Spigots DIN 11850, Series 3 Butt Weld Spigots DIN 11866, series A Butt Weld Spigots EN ISO 1127 Butt Weld Spigots JIS-G 3459 Clamps ASME BPE for pipe ASME BPE length EN 558-1, series 7 Clamps ASME BPE for pipe ASME BPE, short design Clamps DIN 32676 for pipe DIN 11850 length EN 558-1, series 7 Clamps following ASME BPE for pipe EN ISO 1127, length EN 558-1 series 7 One side threaded spigot acc. (to DIN 11851), other side cone spigot and union nut acc. to DIN 11851 Threaded Sockets DIN ISO 228 Threaded spigots acc. to DIN 11851
Valve Body Material 1.4435 (316L) Block Material 1.4435 (316L) forged body 1.4435 (ASTM A 351 CF3M) Investment casting (Material equivalency 316L) MS, brass
Diaphragm Material1 EPDM (for actuator size 1) EPDM (for actuator size 1) EPDM, max. 130°C EPDM, max. 150°C EPDM, max. 150°C EPDM, max. 150°C FPM FPM (for actuator size 1) PTFE/EPDM, PTFE laminated max. 150°C PTFE/EPDM, PTFE laminated max. 150°C (for actuator size 1)
Supply Voltages/Frequency 24 V 50/60 Hz ±10% 120 V 50/60 Hz ±10% 230 V 50/60 Hz ±10%
Integrated Control Modules
Without Control of valve position. (Field bus connection for LonWorks) Control of valve position. (Analogue signal processing) Control of process variables. (Field bus connection for LonWorks) Control of process variables. (Analogue signal processing)
Design Operating time approx. 17 sec., with 10 kΩ potentiometer Operating time approx. 45 sec., 2 switching contacts Operating time approx. 45 sec., with 10 kΩ potentiometer Standard: approx. 17 sec. operating time, 2 switching contacts
Surface Finish2 Ra ≤ 0.25 µm, electropolished internal/external Ra ≤ 0.25 µm, mechanically polished internal, blasted external Ra ≤ 0.4 µm, electropolished internal/external Ra ≤ 0.4 µm, mechanically polished internal, blasted external Ra ≤ 0.6 µm, electropolished internal/external Ra ≤ 0.6 µm, mechanically polished internal, blasted external Ra ≤ 0.8 µm, electropolished internal/external Ra ≤ 0.8 µm, mechanically polished internal, blasted external Ra ≤ 6.3 µm, blasted internal/external Ra ≤ 6.3 µm, electropolished internal/external
Actuator (K-no.) With metal distance piece with diaphragm size 10 With metal distance piece with diaphragm size 8 Without metal distance piece
Ambient Temperature -15 to +55 ºC
Power Consumption 3.5 VA
Rating Continuously rated
Load Resistor 32 Ω (with reverse diode)
Operating Time approx. 17 or 45 s
Protection Class IP 65 acc. to DIN 40050
Electrical Connection 2 x Circular connector (Binder Series 717) (Design with integrated control module) 2 x PG 13.5 (Design without integrated control module)

Working Medium

Working Medium Corrosive, inert, gaseous and liquid media which have no negative impact on the physical and chemical properties of the body and diaphragm material.
Temperature of Working Medium Direct mount (actuator design 2): + 60°C With distance piece (actuator design 1+3): +130°C
  • 1 Materials comply with FDA requirements, except FPM. Steam sterilisation temperature (valid for actuator sizes 1 + 3)
  • 2 Ra acc. to DIN 4768; at defined reference points. The available internal surface finishes are dependent on the inside diameter and the body production procedure.