Diaphragm valves operate through a flexible fluoropolymer diaphragm, which is tensioned by the effect of a shaft-punch of linear movement until it makes contact with the body that acts as a seat. In these valves, the fluid is isolated from the parts of the operating mechanism, making them ideal for corrosive or viscous services, avoiding any contamination to or from the outside.
There are two main types of diaphragm valves: landfill type y straight step type.
Also known as Saunders valves, these are preferable for throttling applications and offer a tight seal. They operate with a shorter stroke, allowing the use of fluoropolymer materials for the diaphragm.
The straight-through type diaphragm valve is suitable for (ON-OFF) service only. It has the same interior diameters and conformation as the pipe. To operate these valves, longer strokes are required. In the open position, they allow rectilinear flow, while in the closed position, the plug sits at the bottom of the valve body.
Lining material: PFA, FEP, PO, etc.
Operation methods: The SIESA® Diaphragm Valve is a flow control device designed to handle liquids and gases in a variety of industrial applications. This valve uses a flexible diaphragm that is lifted or pressed against a seat within the valve body to control the passage of fluid. It is especially useful in systems where tight shutoff is required, even with corrosive or viscous liquids..
Design and Manufacturing Standard | HG/T 3704, GB/T 12239 | MSS-SP-88 |
Face to Face Dimension Standard | HG/T 3704, GB/T 12221 | EN 558-1 | |||
Flange Standard | HG/T 20592, GB/T 9119 | ASME B16, 5, JIS B2220 | |||
Inspection and Testing Standard | GB/T 13927, JB/T 9092 | 598 API | |||
Nominal diameter | DN15-DN300 | ½”-12” | |||
Nominal Pressure (MPa) | 0.6 | 1.0 | 1.6 | 150 lbs | |
Discipline de Pressure (MPa) | Body Pressure Test | 0.9 | 1.5 | 1.5 | 1.5 |
High Pressure Closure Test | 0.66 | 1.1 | 1.1 | 1.1 | |
Low Pressure Closing Test | 0.6 | 0.6 | 0.6 | 0.60 | |
Temperature Range (°C) | PFA-30-200 FEP-30-150 PO-10-80 | ||||
Applicable medium | Strong corrosive medium, i.e. Hydrochloric Acid, Nitric Acid. Hydrofluoric Acid, Liquid Chlorine, Sulfuric Acid and Aqua Regia, etc. | ||||
