The diaphragms of electromagnetic pulse valves can be classified according to four major dimensions: structural form, material, compatible valve type,
and caliber specification, and the working conditions and scenarios applicable to different categories vary significantly.
Classification by Structural Form
Flat Diaphragm: The most commonly adopted type features a peripherally fixed circular thin plate with uniform cross-section. It delivers even force distribution and is
compatible with the vast majority of standard dust removal pulse valves.
Flexural-linkage Diaphragm: This is a circular plate structure with slotted edges, where elastic strain concentrates in the annular edge groove. Its rigid central part
moves nearly translationally under compression, making it mostly applied in high-precision sensing-type pulse valve scenarios.
Corrugated Diaphragm: Molded with concentric annular corrugations, it can significantly increase the central displacement of the diaphragm. It can also be assembled
into a diaphragm capsule or diaphragm capsule set, suited for working conditions requiring large-stroke opening and closing.
Classification by Core Material
Nitrile Butadiene Rubber (NBR) Diaphragm: It boasts excellent oil resistance, with a standard operating temperature range of -20°C to +80°C. As the most widely used
cost-effective diaphragm on the market, it will rapidly age and crack when the temperature exceeds 80°C, and is strictly forbidden for steam working conditions.
Ethylene Propylene Diene Monomer (EPDM) Diaphragm: It resists damp-heat aging, acids and alkalis, with a maximum temperature resistance up to 180°C. It is the first
choice for low-pressure saturated steam working conditions, while it offers no resistance to oils and organic solvents.
Fluoroelastomer (FKM) Diaphragm: It is resistant to oils, weak corrosion and solvents, with a maximum temperature tolerance reaching 200°C. It is prone to hydrolysis
and aging under long-term exposure to high-temperature steam.
Polytetrafluoroethylene (PTFE) Composite Diaphragm: It provides full corrosion resistance, with an operating temperature range of -50°C to +200°C. Pure PTFE has
poor elasticity, so it must be used composited with a rubber substrate, resulting in a relatively high overall cost.
Special Material Diaphragms: These cover niche varieties such as epichlorohydrin rubber diaphragms (featuring good air tightness and aging resistance) and silicone
rubber diaphragms (resistant to extreme high and low temperatures, covering a temperature range of -80°C to 232°C).
Classification by Adapted Solenoid Pulse Valve Type
Right-angle Type Solenoid Pulse Valve Diaphragm: Compatible with right-angle valves where the inlet and outlet of the valve body form a 90° angle. It is directly
connected externally to the blowpipe, making it the most commonly used category in dust removal systems.
Straight-through Type Solenoid Pulse Valve Diaphragm: Adapted for straight-through valves with a 180° angle between the valve body inlet and outlet, mostly used in
dust removal scenarios with special pipeline layouts.
Submerged Type Solenoid Pulse Valve Diaphragm: Suitable for submerged valves whose air inlet is immersed inside the air bag. It features low blowback resistance and
is ideal for ash cleaning systems matched with large-capacity air bags.
Classification by Caliber Specification
The conventional product line on the market covers the full series of specifications from 1 inch, 1.5 inches, 2 inches, 2.5 inches, 3 inches to 3.5 inches and 4 inches,
which can match solenoid pulse valves of different nominal diameters. Customization of special sizes according to provided drawings is supported.
As the core vulnerable component of the dust removal and ash cleaning system, diaphragms for solenoid pulse valves of different classifications vary significantly in
service life and applicable working conditions.
