German CEMB valves CEMB models CEMB prices

CEMB valves are globe valves that use a diaphragm as the closing element to seal the flow passage, shut off fluid, and separate the valve body cavity from the valve bonnet cavity. Diaphragms are commonly made of elastic, corrosion-resistant, non-permeable materials such as rubber and plastic. Valve bodies are mostly made of plastic, fiberglass, ceramic, or metal with rubber lining. They feature a simple structure, good sealing and anti-corrosion performance, and low fluid resistance. They are used for media with low pressure, low temperature, strong corrosiveness, and suspended solids. By structural form, they are classified as weir type, globe type, gate type, etc. By actuation method, they are classified as manual, pneumatic, and electric.

CEMB valve functions

A diaphragm valve contains a flexible or composite diaphragm inside the valve body and bonnet, with its closing member being a compression device connected to the diaphragm. The seat can be weir-shaped or the wall of a straight-through flow passage. The advantage of a diaphragm valve is that its operating mechanism is isolated from the media path, which not only ensures the purity of the working medium but also prevents the possibility of media in the pipeline impacting the operating components. In addition, no separate sealing is required at the stem, unless used as a safety facility for controlling hazardous media. In diaphragm valves, since the working medium contacts only the diaphragm and the valve body, both of which can be made of various different materials, the valve can ideally control various working media, especially those with chemical corrosiveness or suspended particles. The operating temperature of a diaphragm valve is usually limited by the materials used for the diaphragm and the valve body lining; its operating temperature range is approximately -50 to 175 °C. The diaphragm valve has a simple structure, consisting of only three main components: the valve body, the diaphragm, and the valve head assembly. The valve is easy to disassemble and maintain quickly, and diaphragm replacement can be completed on-site in a short time.

CEMB valve working principle

Diaphragm valves use a corrosion-resistant lined valve body and a corrosion-resistant diaphragm to replace the valve core assembly, utilizing the movement of the diaphragm for regulation. The valve body material of diaphragm valves is cast iron, cast steel, or cast stainless steel, lined with various corrosion-resistant or wear-resistant materials; diaphragm materials include rubber and polytetrafluoroethylene. The lined diaphragm has strong corrosion resistance and is suitable for regulating strongly corrosive media such as strong acids and strong alkalis. Diaphragm valves have a simple structure, low fluid resistance, and greater flow capacity than other types of valves of the same specification; they are leak-free and can be used for regulating high-viscosity media and media with suspended particles. The diaphragm isolates the medium from the upper chamber of the valve stem, so there is no packing and the medium will not leak out. However, due to limitations of the diaphragm and lining materials, pressure resistance and temperature resistance are relatively poor, generally applicable only to nominal pressures up to 1.6MPa and temperatures below 150 °C. The flow characteristic of a diaphragm valve is close to quick-opening; it is approximately linear before 60% travel, and the flow change is not significant after 60%. Pneumatic diaphragm valves can be equipped with feedback signals, limiters, and positioners to meet the needs of automatic control, program control, or flow regulation. The feedback signal of pneumatic diaphragm valves uses contactless sensing technology. This product uses a diaphragm-type thrust cylinder to replace the piston cylinder, eliminating the disadvantage that the piston ring is easily damaged, causing leakage and preventing the valve from opening and closing. When the air source fails, the handwheel can still be operated to open and close the valve.

CEMB valve application scenarios

A diaphragm valve is a special form of shut-off valve, whose closing element is a diaphragm made of soft material, which separates the valve body cavity from the valve bonnet cavity. Due to limitations of the valve body lining process and diaphragm manufacturing process, it is difficult to manufacture larger valve body linings and larger diaphragms, so diaphragm valves are not suitable for larger pipe diameters and are generally applied in pipelines ≤ DN200. Due to limitations of diaphragm materials, diaphragm valves are suitable for low-pressure and low-temperature occasions. Generally, the temperature should not exceed 180 °C. Since diaphragm valves have good anti-corrosion performance, they are mostly used in devices and pipelines for corrosive media. The applicable media and operating temperature of diaphragm valves are limited by the valve body lining material and the diaphragm material.

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