Butterfly Valves Types and Terms
Types of Butterfly Valves
-
use various grade aluminums for their makeup. Aluminum is commendable
for its ultra lightweight and above average strength, but unlike stainless
steel, aluminum is prone to corrosion over time.
- are industrial companies that make butterfly valves.
-
are valves that have threaded metal inserts in the bolt holes that
allow a system to use two sets of bolts without nuts. Lug valves
are installed between two flanges and are used to disconnect one
side of the piping system without distributing the other.
-
are cheap and offer higher flexibility than their metal counterparts.
With these benefits, a lower maximum pressure and temperature stability
are to be expected.
- are the most common type of butterfly valves. Stainless
steel is used for its strength and anti-corrosive properties.
-
are installed between two flanges and are secured using bolts or nuts
and studs.
Butterfly Valve Terms
-
The part of a valve that converts electrical, fluid or thermal energy
into mechanical energy in order to open/close the valve.
- The process of mixing
air with a high content of oxygen into a liquid. Carburetor butterfly
valves go through aeration when mixing oxygen with fuel.
- Force on the
upstream part of a butterfly valve or valve seat.
- A support typically
used in conjunction with butterfly valves to hold the revolving shaft
in its appropriate position.
- A solid plate-like
fitting used to seal a flanged end pipe's end.
- The part of a valve
that connects the body to the valve actuator. The bonnet sometimes includes
the stem packing.
-
The turning force required to rotate the closure element of a butterfly
or rotary valve.
- The rim at the end
of a fitting, pipe or valve that allows for bolting onto an additional
pipe element.
(
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- A device used to read and signify the flow rate of a material.
- The weight, mass
or volume of a gas, liquid or solid through a medium per unit of time.
- A valve similar
to a butterfly valve. Gate valves are not used in throttling applications
because they are either entirely open or entirely closed.
- Area of a valve through
which fluid enters.
- The amount of fluid
that passes through a valve while it is in the off position. The most
common unit for measuring leakage is in volume/time.
- The opening in a valve
through which fluid exits.
-
A unit of measurement that signifies the level of pressure of a liquid,
solid or gas in a valve system.
- The amount of pressure
in a flow stream that is reduced as a direct result of the design of the
control valve. Recovery is also described as the ratio of maximum downstream
pressure to upstream pressure.
- The value
of the turning force that is needed to close a valve.
- A flange that
slides over the end of piping and is then welded in place.
- Regulation of flow
or current through a valve.
- The inner parts of a
valve that are in contact with the flow stream.
- The main part
of a valve that contains passages for the flowing material.
- Term for when
an actuator is able to provide a slower operating time over the entire
range of operation.
- The area of
a valve at which the flow stream is the slowest, usually downstream of
the physical constriction.