GEMÜ 690 20D7871141, Serial: I-DE-88072436-00-2804452 Pneumatic Plastic Diaphragm Valve

Overview

The GEMÜ 690 20D7871141 is a 2/2-way pneumatic diaphragm valve from the GEMÜ R690 series. The string I-DE-88072436-00-2804452 is the factory serial number for traceability, not part of the order code. This is DN20, PVDF body, EPDM diaphragm, union end connection, normally closed function. It is a weir-type diaphragm valve; only the body and diaphragm contact the medium, eliminating stem packing leakage risk. It is widely used in chemical, surface treatment, wastewater and battery wet process lines for corrosive fluid on-off control.

Features

The GEMÜ 690 20D7871141 adopts compact glass-fiber reinforced polypropylene pneumatic actuator with visual position indicator.690 20D7871141 supports low dead space weir flow path, suitable for medium with fine suspended particles. PVDF body provides excellent resistance to acids, alkalis and oxidizing chemicals. EPDM diaphragm offers good elasticity and fatigue resistance for frequent cycling. Available in union spigot end for solvent cementing or thermal fusion welding. Simple maintenance; only diaphragm is the main wear spare part.

Specs

Device Type: Pneumatic 2/2-way diaphragm valve Model: GEMÜ 690 20D7871141 Serial No: I-DE-88072436-00-2804452 Brand: GEMÜ Series: R690 Size: DN20 Body material: PVDF Diaphragm material: EPDM Function: Normally closed (NC) Max medium pressure: 10 bar Medium temperature: -10 °C ~ +80 °C Actuator supply: 4–7 bar compressed air Connection: True union spigot Standard: ISO 9001, relevant industrial plastic valve norms

Principle

When compressed air is supplied to the actuator of the GEMÜ 690 20D7871141, the internal piston pushes the diaphragm away from the weir, opening the flow path. When air is exhausted, the spring pushes the diaphragm back onto the weir to shut off the fluid. The medium is fully isolated from the actuator and moving parts.

Applications

The GEMÜ 690 20D7871141 is used for corrosive liquid switching in chemical plants, electroplating, etching, wastewater treatment and lithium battery wet process. The GEMÜ 690 20D7871141 is stocked as spare for existing R690 piping skids.