GEMU 690 25D78205E11/N I-DE-88225821-00-3498875 Product Description

Overview

GEMU 690 25D78205E11/N I-DE-88225821-00-3498875 is a 2/2-way pneumatic actuated plastic diaphragm valve from GEMU 690 series, DN25 nominal size. The GEMU 690 25D78205E11/N is designed for corrosive chemical media, the suffix I-DE-88225821-00-3498875 is the factory unique serial and identification number of this unit. This GEMU 690 DN25 pneumatic diaphragm valve serves as a reliable GEMU 690 plastic diaphragm valve, adopting full plastic wetted structure and low-maintenance diaphragm actuator for chemical, water treatment and plating process piping of the GEMU 690 plastic diaphragm valve.

Features

This GEMU 690 25D78205E11/N uses a compact diaphragm type pneumatic actuator, available in normally closed configuration for the GEMU 690 plastic diaphragm valve. The wetted body and diaphragm are selected for strong chemical resistance, suitable for acidic, alkaline and aggressive liquid media. The diaphragm sealing principle separates the actuator completely from process fluid, no stuffing box leakage risk and insensitive to particle-laden media. The GEMU 690 25D78205E11/N supports bidirectional sealing, can be installed in any mounting orientation. It can be fitted with optional electrical position feedback switch, pneumatic positioner or stroke limiter according to loop control requirements. Uniform installation dimension across different DN sizes simplifies piping layout and spare part management of the GEMU 690 plastic diaphragm valve.

Specs

The GEMU 690 25D78205E11/N series: GEMU 690, 2/2-way pneumatic diaphragm valve, DN25. Body material: plastic construction following 78205 ordering code. Diaphragm: EPDM / FKM / PTFE composite option per E11 code. Max working pressure: 10 bar. Media temperature range: -10°C to +80°C. Control air: dry neutral compressed air. Connection type: solvent socket / union end. The GEMU 690 25D78205E11/N complies with CE, NSF and relevant industrial fluid standards as a GEMU 690 DN25 pneumatic diaphragm valve.

Principle

GEMU 690 25D78205E11/N I-DE-88225821-00-3498875 controls the opening and closing of flow passage by compressed air acting on the actuator diaphragm. The GEMU 690 25D78205E11/N actuator diaphragm pushes the internal stem to press or release the process diaphragm. When the process diaphragm presses against the valve weir, the fluid path is shut off; when lifted, the medium flows through the full bore channel. The process diaphragm acts as the only sealing element, isolating the process fluid from the top actuator assembly. The weir-type diaphragm structure of the GEMU 690 plastic diaphragm valve ensures tight shut-off and low dead volume.

Applications

This GEMU 690 25D78205E11/N is widely used in chemical processing, waste water treatment, electroplating, pickling lines, flue gas desulfurization and ultrapure water systems. It is used for on/off control of corrosive liquids, chemical dosing and scrubber fluid loops. It is stocked for piping retrofit and maintenance replacement of existing GEMU 690 valve installations. The GEMU 690 25D78205E11/N I-DE-88225821-00-3498875 delivers reliable tight shut-off for aggressive chemical fluid control loops as a proven GEMU 690 DN25 pneumatic diaphragm valve.