17
16
3. EXAMPLE IN RELAY SYSTEM PIPING: D/E/F
• Relay system piping method that connects two or
more Knockers in series. This method is connecting
a relay tube from air tank of the Knocker (cross
valve side) to air supply and exhaust opening of
another Knocker.
• When using relay system piping, Knocking action
starts in order from a Knocker that is located
in cross valve side to other Knockers. The
maximum number of Knocker that can be used
is regulated by the type of control.
• When arranging relay piping, please set the
actuation of the solenoid valve at 1 second or more. When the tube length of relay piping becomes
long and/or the number of relay pipes increase, please extend actuation of the solenoid valve.
D. When using the three-way solenoid valve model (maximum 5 units):
E. When using the HKA and EKE model exclusive control board (maximum 10 units per system):
F. When using the air operation controller KNR-CONTROL AOC model (maximum 3 units):
Dummy tube
Relay tube
Tube cap
Intake
Exhaust
Knocker
Knocker
No.2
No.1
Make the length of the
piping tubes equal
5/16 OD
When using the HKA, EKE exclusive control panel
Hopper
Air Knocker
Relay tube
Dummy tube
Hopper
A line
B line
Exhaust
Power Source
Control panel
Compressor
Filter Regulator
Relay tube
5/16 OD
OUT
Dummy tube
When using with three-way solenoid valve
Hopper
Air Knocker
Timer1
Timer2
Compressor
Filter Regulator
Complex timer or Switch
IN
EXH
KNR-CONTROL AOC
OFF
ON
5/16 OD
When using the air operation controller KNR-CONTROL AOC
Exhaust
Compressor
Filter Regulator
Air Knocker
Relay tube
Dummy tube
4. TUBE LENGTH OF RELAY SYSTEM PIPING AND AIR PRESSURE
• In relay system piping, compressed air in the relay tube is also used for operation air of the Knocker.
Accordingly, the air pressure is not to exceed the regulated valve. (Refer to length of relay tube in
relay system piping and air pressure)
• Use 5/16 OD nylon or urethane tube when arrange piping between Knockers and control
equipment. (Please use 1/4 OD tube for KNR-20.)
• Arrange tube length to the first Knocker as referenced in standard piping, section 2.
• It is recommended to connect a piece of dummy tube (that is same length as the relay tube) to the
terminal Knocker, so the knocking force of every Knocker is equal. (Refer to Section 3. Example of
relay system piping - pg. 13)
• In order to prevent an air leak, please equip the end of the dummy tube with a cap.
• In relay system piping, the knocking force increases when the tube length is extended but it will effect
the durability of the Knocker unit.
• Length of connecting tube (relay tube) for 2nd and other Knockers are dependent on the type of
Knocker. Length between is not to exceed the maximum length. Also, make the length as even as
possible to balance knocking force. (Refer to table)
Knocking force at value listed above is equivalent to the knocking force at maximum air
pressure (102 psi) in standard piping
Start Knocking in Order from No. 1
(From Lower to Upper)
Length of Relay Tube in Relay System Piping and Air Pressure
Model (KNR-)
Relay Tube Length (ft)
Working Pressure (PSI)
20 / 20-SS / 20
3.25 or less
44 or above
30 / 30-SS / 30-DI
3.25 or less
44 or above
40 / 40-SS / 40-DI
16.5 or less
58 or above
60 / 60-SS / 60-DI
16.5 or less
73 or above
80 / 80-DI
32.75 or less
73 or above
100 / 100-DI
32.75 or less
80 or above