Working Principle Of Diaphragm Valve

Working Principle Of Diaphragm Valve

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Item: COVNA Diaphragm Valve

Actuator Options: Manual operated or pneumatically operated

Material Options: Plastic or stainless steel

Max. Pressure: 4 bar

Max. Temperature: 90°C

Features: Anti-corrosion and minimal leakage

Applications: Chemical industry, food and beverage, paper and pulp, etc.

Note: Not suitable for high-temperature or high-pressure applications

Price: Reach out to us to discuss your requirements about Knife Gate Valve. Our knowledgeable sales team will assist you in finding the best options for your needs.

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The diaphragm valve functions by utilizing the diaphragm as a closing element to block the flow path and stop the flow. The valve body cavity and valve cover cavity are separated by this cutoff valve. Typically, diaphragms are made of rubber, plastic, or other elastic, corrosion-resistant, non-permeable materials. The valve body material can include plastic, glass fiber reinforced plastic, ceramics, or metal linings. The design offers several advantages: a simple structure, excellent sealing and corrosion resistance, along with low fluid resistance, making it suitable for low-pressure, low-temperature, highly corrosive mediums and those containing suspended solids.

In terms of structure, diaphragm valves can be categorized into roof ridge style, cutoff style, and gate style. Operation methods include manual, pneumatic, and electric diaphragm valves.

Working Principle And Composition

Diaphragm valves utilize a corrosion-resistant lining in the valve body alongside a corrosion-resistant diaphragm, replacing traditional valve core components. The diaphragm's motion controls the flow. These valves are constructed from cast iron, steel, or stainless steel and lined with materials resistant to corrosion or wear, such as rubber and polytetrafluoroethylene. The diaphragm's lining is especially resilient against strong acids and bases.

Diaphragm valves have a simple structure, lower fluid resistance, and better flow capacity than other valve types of the same specifications. They provide leak-free operation and can handle highly viscous and particulate-laden mediums. The diaphragm effectively isolates the medium from the upper valve cavity, preventing packing mediums from leaking. However, due to limitations in diaphragm and lining materials, their pressure and temperature resistance is lower, typically rated for 1.6 MPa nominal pressure and up to 150°C.

The flow characteristic of a diaphragm valve is similar to a quickly opening valve, showing an approximately linear response up to 60% of the stroke, with minor changes beyond that. Pneumatic diaphragm valves can be equipped with feedback signals and positioners to accommodate automatic control or flow regulation needs. These valves utilize non-contact sensing technology for feedback, employing a diaphragm to activate the air cylinder. This design eliminates issues related to piston damage and leakage that can hinder operation. In case of air supply failure, manual operation via a handwheel is possible to open or close the valve.

If you are in need of a diaphragm valve, please contact us, and we will assist you in selecting the most suitable option!