WCD: Wear Compensating Device
All Cox Powerflow & Ultraflow applicators have a patented Wear Compensating Device engineered to maximise the life duration of the guns by counteracting the inevitable wear in the drive mechanism. This ensures:
- Minimum free play in the trigger.
- Instant rod drive when the trigger is pulled.
- Fewer strokes to empty a cartridge.
WCD is not required for pneumatic applicators as the drive mechanism operates in a totally different way.
PRD: Pressure Relieve Device (manual applicators)
The PRD gives a limited and instant return on the drive rod as soon as trigger pressure is released. This releases the pressure built up in the cartridge and stops "flow on"®, resulting in a non-drip system.
Two manual models are available with PRD: MIDIFLOW and EASIFLOW HD. These can be recommended for less experienced users.
PRD is not required for pneumatic models as air pressure is automatically vented once the trigger is released, stopping any flow on.
Release plate (manual applicators)
Operating the release plate frees the drive rod, enabling it to be drawn back to change the cartridge or sachet or to refill the barrel with bulk material. It also releases the pressure built up in the cartridge.
Pneumatic applicators do not have release plates.
Epoxy coating
Epoxy is a high quality, anti-corrosion powder coating that gives the metal a hard-wearing and durable finish. The metal frames of all Cox applicators are epoxy coated for long, corrosion-free life.
Blue sachet plunger
The Cox blue sachet plunger has been designed and engineered to empty sachets reliably and efficiently without pinching or wasting material.
Cradle frame design
The cradle frame design on all the higher-powered models, both single and two-component, not only supports and positions the cartridge, making loading very easy, it also adds substantial strength to the frame. This not only enables materials with high viscosity to be dispensed without damage to the applicator, it also extends product life and maximises investment.
Trigger ratio (manual applicators)
The trigger ratio determines the mechanical advantage of the gun. It is the ratio between the effort to pull the trigger and the load applied on the material: the higher the trigger ratio, the greater the force applied on the material to be dispensed.
The more viscous the material to be dispensed, the higher trigger ratio is recommended to increase operation comfort and efficiency.
The trigger ratios of single component applicator families are shown below.
| Material viscosity | Trigger ratio | COX single component product family |
|---|---|---|
| Low viscosity | 7:1 | EASIFLOW |
| Low/medium viscosity | 10:1 | MIDIFLOW |
| Medium viscosity | 12:1 | POWERFLOW |
| High viscosity | 18:1 | POWERFLOW HP |
| Very high viscosity | 25:1 | ULTRAFLOW |
Note: For two-component applications, the mixer nozzle causes a substantial restriction to flow and trigger ratios therefore need to be substantially higher to ensure good mixing and easy application.
Thrust (pneumatic applicators)
Thrust in pneumatic applicators is equivalent to trigger ratio in manual applicators.
The thrust available is directly proportional to the diameter of the barrel and the air pressure used: the larger the diameter, the greater the thrust.
The equation to calculate the thrust is ∏R2 x Bar
Example with a barrel of 5cm diameter (2.5cm radius) operated at 6.8bar pressure.
Thrust = 3.142 x (2.54 x 2.54) x 6.8 = 137.8 kgf (1.35kN)
Note that all except the very smallest (CBA 25) of Cox pneumatic applicators operate at 6.8bar pressure, the thrust being governed by the diameter of the barrel.
Cylinder size (Pneumatic applicators)
Cylinder size provide the following force at 6.8 Bar (100psi)
- 98.4∅ 517kgf (5.07kN) 'A' series air guns.
- 90.0∅ 432kgf (4.24kN) Airflow I 1000S.
- 76.2∅ 304kgf (3.04kN) Bait guns / Airflow I bulk.
- 63.5∅ 215kgf (2.11kN) 'B' series air guns.
- 50.8∅ 138kgf (1.35kN) Standard air guns.
Plunger rod configuration (Pneumatic applicators)
Three in-line rods
This configuration provides the most efficient transfer of thrust from the drive rod to the plunger rods. It is therefore ideal for tough applications involving high viscosity materials.
Triangulated plate
The drive rod and two plunger rods are connected via a triangulated plate. It provides balanced thrust to both cartridges but its efficiency is unsuitable for high viscosity materials.
Plunger and satellite
This simple arrangement consists of one satellite plunger rod connected to the main drive rod. It is effective where the thrust requirement of the satellite cartridge is relatively small.