Diaphragm Valves Types and Terms
Types of Diaphragm Valves
- are intended to be used in the biotechnology
fields — agriculture, food science, pharmaceuticals and medicine.
Biotech valves must be sanitary.
- can be used to divert flow from an inlet
to two or more outlets; they can also be used in reverse to feed flow from
one line into two or more lines.
- are designed for use at the bottom of
a tank or vessel, to drain or sample from the tank.
- are
designed to eliminate deadlegs or areas where bacteria might become trapped
in the valve.
- are specially designed to be used in sanitary and aseptic
(sterile) applications.
- include any type of mechanical device that can stop,
start or regulate the flow of liquid, gas, solid material or steam.
- have a raised section, or "weir," on which the diaphragm
presses to create a seal.
- have the valve weir (the notch through which
material flows) located flush against the interior of the pipe, thus eliminating
stagnant areas within the valves.
Diaphragm Valve Terms
- Controls that switch the position of a valve from open or
partially open to partially or completely closed. Actuator operation
may be manual, pneumatic or hydraulic.
- The pressure at the outlet of a relief valve, caused
by pressure in the discharge system. Pressures may be constant or variable.
- A sealing device that prevents leaks between the valve stem
and the body of the valve.
- A cover fitted over the valve body, which may be removed for
valve maintenance.
- The pressure at which leaks start to flow through
a valve.
- Ethylene propylene diene monomer. EPDM is a commonly used rubber
seal material that is compatible with many chemicals.
- A type
of pipe fitting that attaches with nuts and bolts.
-
A pipe fitting that uses a socket and a union nut to form a connection.
Flares are one of the most crevice-free pipe fittings and may be used
for ultrapure processes.
- Gallons per minute. Used to measure flow through a pipe, valve,
inlet or outlet.
- A rubber
seal with an "o" shape, used to seal connections
between pipes and valves.
- Passages that allow flow into and out of a valve.
- The pressure from an inlet that a valve is adjusted to
open, maintain or control under service conditions.
- A rod that spans the inside and outside of a valve, transmitting
motion to control the internal disc, which moves to seal or unseal the
valve.
- A seal formed into a u-shaped channel. This type of seal may
be used when an O-ring is not desirable.