Instruction Manual
Page 5 of 28
Issue: 2.2
Operating Principle – Section 1.2
The Assembly comprises of:-
•
Central Air Piston and ‘change over’ Valves
•
2 off Quick Exhaust and muffler assembly
•
2 off Dynamic Chambers and Fluid Pistons
•
2 off Fluid Pressure Chambers each complete with Suction
and Pressure Ball Check Valve Assemblies
•
1 off Fluid Inlet Manifold
•
1 off Fluid Outlet Manifold
•
Support Bracket
The Pumps have horizontally opposed positive displacement pistons connected to a
common reciprocating air motor piston. The pneumatically driven piston actuates pilot air
control valves at the end of its travel producing an air logic signal to shuttle the spool valve
initiating the opposite stroke.
The air pilot valves contain no springs. They are operated by magnetic force and reset by
the main piston air supply and retained in position by a magnetic detent. The main spool
valve is air piloted and contains two exhaust ports. Both the pilot valves and the main spool
valve are easily removable.
There are no external air pilot hoses. The air logic and exhaust ports are internal. Simply
mounting the spool valve and the pilot valves assures that the logic circuits are connected
properly.
The air cylinder exhaust air is channelled through two independent quick exhaust valves to
minimises piston reversal time.
The “4-Ball” fluid section design refers to the two sets of ball checks. Each fluid chamber
has an inlet and outlet ball check, the inlet check is uniquely positioned in the piston saving
space and reducing the overall weight of the pump. The inlet and outlet ball checks are
connected by a common inlet manifold and outlet manifold respectively.
A bellows provides the fluid seal on the connecting rod within the inlet chamber, whilst a
main piston seal maintains the pump fluid pressure within the pressure chamber.
When the main piston seal starts to pass fluid due to wear, any leakage passes into the
inlet chamber.
