Maria Valve
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A diaphragm valve is a specialized shut-off valve. Its core operation relies on a flexible diaphragm to open and close, which fully isolates the valve body cavity from the bonnet and actuator components, ensuring zero external leakage. Featuring a simple structure consisting of three main components (valve body, diaphragm, and bonnet) with no packing seal, it is extensively applied in fluid control scenarios involving medium-low pressure, highly corrosive media, high-purity fluids, or fluids with suspended solids.
| Parameter Item | Standard Range | Remarks (Material Impact) |
|---|---|---|
| Nominal Pressure | PN10~PN16 (1.0~1.6MPa); High-pressure type PN25 (2.5MPa) | Limited by diaphragm pressure resistance; Overpressure easily causes fatigue and rupture |
| Working Temperature | -50℃~200℃ (Subject to diaphragm material) | Rubber: -20℃~120℃; PTFE: -100℃~260℃ (Pressure control required) |
| Nominal Diameter (DN) | DN15~DN300; Commonly used DN≤200 | Manufacturing process of large-diameter diaphragms is limited |
| Flow Characteristic | Near quick-opening, approximately linear before 60% stroke | Suitable for quick on-off and rough regulation |
| Connection Type | Flange, Thread, Weld, Clamp (Sanitary grade) | Sanitary grade mostly adopts clamp / quick-install, compatible with CIP/SIP cleaning |
The diaphragm completely isolates the medium from actuator components, eliminating packing seal leakage for environmental safety.
Options include rubber-lined, fluorine-lined, and fluoroplastic materials, suitable for strong acid & alkali applications.
Dead-end-free flow path, easy for CIP/SIP cleaning, compliant with GMP/FDA standards for pharmaceutical & food industries.
Quick diaphragm replacement without complex tools, reducing maintenance costs significantly.
Valve Body Material: Cast Iron / Cast Steel; 304/316/316L Stainless Steel; Hastelloy / Monel; Plastic (PP, PVDF, PFA, PTFE).
Diaphragm Material (Core Wear Part): Natural Rubber, Neoprene, Nitrile Rubber; EPDM (Temperature-resistant); Fluororubber; PTFE (F4).
Actuator: Pneumatic (Aluminum Alloy / Stainless Steel Cylinder); Electric (Motor + Gearbox).
