ROTARY VALVES FEEDERS & AIRLOCKS
precision-built Rotary Valves are ued throughout industry....Wherever
precision volumetric feeding is required. Many standard models,
types and sizes are provided as per
AIR LOCK FEEDERS
Locks and Feeders are usually used to accomplish 3 basic tasks.
Rotary Air Locks are built to work under a variety of conditions.
Three basic designs
DROP THRU TYPE
This is for
gravity discharge of materials from storage hoppers and bins into
SIDE ENTRY TYPE
specially developed for plastic pellet handling and friable granular
BELOW THRU TYPE
is always used with pneumatic conveying lines handling materials difficult
to discharge from the rotary Air lock vanes. This design occupies
less height and is advantageous,
standard 8 or 6 vane rotor is the most commonly used for handling materials
which do not
This is used
along with the Side Entry-Air-Lock for materials that have a tendency to
ROTOR WITH WEAR TIPS
This is a
standard rotor with replaceable bars of steel, brass or Teflon or any
are suitable for most dry dust such as Chemicals, Coffee, Detergents, Dry
SHALLOW POCKET ROTOR
reduced capacity rotors specially suited to handle sticky products which
HOW TO SPECIFY ROTARY VALVES :-
Selecting the most
appropriate Digidale Rotary valves for your application is extremely
Characteristics :- The product to be handled dictates the
first decision to be
A. Is it powder, granules, Chips or flakes, cubes or pellets ?
Materials that are hard and of large grain ( such as plastic pellets ) may jam a conventional Drop-Thru Rotary Valve.
B. Is it abrasive ?
Abrasive products may
require valves of special construction, or special plating at wear
surfaces. Rotor vanes may require adjustable tips and housings
equipped with inspection
Application 末 Is the rotary valve for metering or non-metering
The application helps further define the model, size and rotor
type. Digidale Drop-Thru
Valves are calculated at 100% pocket fill for metering applications.
Non-metering valves should be selected to have a minimum capacity
of 1.5 times the volume required. Side
Entry Valves operate at a maximum of 40% pocket fill.
Volume & Weight 末 How much and how fast?
establishes the size rotary valve required, for either metering or
non-metering applications. First
determine: weight of product in kg per cubic mtr and volume required in cubic mtr per hour.
Output capacity is computed based on the following.
PER HR. (KGS.)
capacity is a function of pocket fill and valve speed.
Valves for non-metering applications should be a minimum of 1.5
times required volume.
determine the Output Capacity Rating of a given valve use the following.
CAPACITY (CU.MT./HR.) = ROTOR CAPACITY (CU.MT./REV.) x SPEED (RPM) x
the rotary valve is selected based on inlet and outlet sizes.