Diaphragm Valve
quotation Diaphragm valve is a special form of shut-off valve. Its opening
and closing part is a diaphragm made of soft material, which separates the inner
cavity of the valve body from the inner cavity of the valve cover. The diaphragm
valve is actually just a "clamping" valve. An elastic, disturbing diaphragm is
bolted to the compression part. The compression part is operated by the valve
stem to move up and down. When the compression part rises, the diaphragm It
lifts high and creates a passage. When the compression member drops, the
diaphragm presses on the valve body weir (if it is a weir valve) or presses on
the bottom of the contour (if it is a straight-through type). The diaphragm
valve is suitable for switching and throttling. use. Specifications Connection
type: Welding/Thread Pressure of work: 1.0Mpa Dimension standard: GB, BS, ANSI,
JIS Working temperature: 鈮?0鈩? 鈮?00鈩? 鈮?20鈩? 鈮?50鈩?/p> Valve Body Material:
CI, DI, WCB, SS, PPH, FVDF, CPVC, UPVC Diaphragm Material: EPDM+F46/FEP(F46)/PFA
Size available: DN15-DN100 Actuator Material: Aluminium Alloy Actuator type:
double acting, single acting(spring return) Actuator accessories: limit switch
box, Solenoid valve, positioner, quick exhaust valve, manual override, air
regulator+gauge Selection of end connection form The commonly used connection
forms of valve ends include flange connection, threaded connection, butt welding
connection and socket welding connection. 2.1 Flange connection Flange
connection is conducive to valve installation and disassembly. The valve end
flange sealing surface forms mainly include full surface (FF), raised surface
(RF), concave surface (FM), tongue and groove surface (TG) and ring connection
surface (RJ). The flange standards adopted by API valves are series such as
ASMEB16.5. Sometimes you can see Class 125 and Class 250 grades on flanged
valves. This is the pressure grade of cast iron flanges. It is the same as the
connection size of Class 150 and Class 300, except that the sealing surfaces of
the first two are full plane ( FF). Wafer and Lug valves are also flanged. 2.2
Butt welding connection Due to the high strength and good sealing of the
butt-welded joint, the valves connected by the butt-welded in the chemical
system are mostly used in some high temperature, high pressure, highly toxic
media, flammable and explosive occasions. 2.3 Socket welding and threaded
connection Is generally used in piping systems whose nominal size does not
exceed DN40, but cannot be used for fluid media with crevice corrosion. Threaded
connection shall not be used on pipelines with highly toxic and combustible
media, and at the same time, it shall be avoided to be used in cyclic loading
conditions. At present, it is used in the occasions where the pressure is not
high in the project. The thread form on the pipeline is mainly tapered pipe
thread. There are two specifications of tapered pipe thread. The cone apex
angles are 55掳 and 60掳 respectively. The two cannot be interchanged. On
pipelines with flammable or highly hazardous media, if installation requires
threaded connection, the nominal size should not exceed DN20 at this time, and
seal welding should be performed after threaded connection.Diaphragm Valve
quotation website:http://www.zzvalvecn.com/diaphragm-valve/
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