Highlight: Flanged Diaphragm Valve
Product introduction:
Diaphragm valve is a special type of shut-off valve that emerged in
the 1920s. Its opening and closing component is a
diaphragm made of soft materials, which separates the inner cavity
of the valve body from the inner cavity of the valve cover
and the driving parts—hence the name "diaphragm valve". It is a
shut-off valve that uses an elastic diaphragm as both the
opening/closing element and the sealing element. The valve body
features a(ridge-type) structure, and the ridge forms a
sealing pair with the diaphragm. The periphery of the diaphragm is
fixed, dividing the valve cavity into two mutually
disconnected parts. The lower part of the diaphragm serves as the
fluid channel. Components such as the valve disc, valve
stem, and valve cover are all located above the diaphragm, isolated
from the fluid. This isolation prevents them from being
corroded by the fluid and also avoids contamination of the fluid by
impurities like rust. Diaphragm valves do not require a
stuffing box, thus eliminating the problem of valve stem sealing.
The inner surface of the valve body is usually lined with
rubber or enamel; alternatively, the entire valve body may be made
of corrosion-resistant metal or non-metallic materials
(such as stainless steel and engineering plastics). The diaphragm
material is typically rubber or fluoroplastic. The service
life of a diaphragm valve depends on the fatigue resistance of its
diaphragm. It is particularly suitable for corrosive fluids
and fluids requiring cleanliness, such as acetic acid, chemical
fiber raw materials, and boiler softened water. Its working
pressure is generally not greater than 0.6 MPa, the working
temperature is usually below 100℃, and the nominal diameter
is not larger than 350 mm.
Product technical parameters:
Nominal Diameter DN (mm) | 15~200 |
Nominal Pressure PN (MPa) | 1.6 |
Test Pressure (MPa) | Strength (water) | 2.4 |
| Enclose (Water) | 1.76 |
Main Components | Body | WCB/CF8/CF8M |
| Valve ball | Stainless steel/Carbon steel |
| Seat | PTFE |
| Packing | Soft graphite |
| Shaft | 2Cr13 |
| Handle | Ductile iron |
Working temperature | ≤150℃ |
Medium suitable | Water, oil, steam |
Product features:
1. The diaphragm made of soft sealing materials such as rubber or
plastic has good sealing performance. Since the
diaphragm is a vulnerable part, it should be replaced regularly
according to the characteristics of the medium.
2. Due to the limitations of diaphragm materials, diaphragm valves
are suitable for low-pressure occasions with relatively
low temperatures.
3. Diaphragm valves can be divided into six types according to
their structural forms: weir type, straight-through type,
globe type, full-bore type, gate type and angle type.
4. Generally, it is not suitable for pipelines with temperatures
higher than 60℃, or for transporting organic solvents and
strong oxidizing media, nor is it suitable for use in pipelines
with relatively high pressure.
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