Cylinder  (Parker  02.00 C4MAU18A 8.000)
Alignment Coupler  (E & E Special Products  # EAC-500F)
4-Way Valve  (Norgren MN01CGA73A000)
Butterfly Valves  (McMaster Carr  # 9798K33)
Roller Valve  (Norgren  # 03061122)
Check Valve  (Deltrol # EDC30B)
Air Gate  (Norgren # 03061122)
Venting Valve  (1/4” ball valve)
Muffler  (Fabricated)


The Short Story  Click on the diagram on the right to see a full page image

Pressurized air (from a shop source) flows through the Cricket Air Circuit, cycling the Ram.

The heart of the Cricket Air Circuit is a Directional Flow Control Air Valve (hereafter referred to as the 4-Way Valve).  The 4-Way Valve is used to route pressurized air (alternately to the front, then rear) to a dual-acting cylinder, to cycle the Ram. 

An Alignment Coupler is used as an interface between the Cylinder and Ram.

A Roller Valve monitors the position of the Ram and signals the 4-Way Valve when it’s time to reverse the direction the Ram is moving.  When the 4-Way Valve receives the signal, it moves an internal mechanism, (called a Spool) to dynamically reconfigure its internal air paths.  After the spool is moved, pressurized air is directed to the opposite end of the cylinder, initiating the change in direction the Ram is moving.

The Ram momentarily continues in the same direction (due to momentum), then reverses direction.  A Check Valve is used on the input port of the 4-Way Valve to prevent back flow of air when the direction the Ram is moving is reversed.

Butterfly Valves are used at the front and back ends of the Cricket Air Circuit to control entry and exit of pressurized air.  The Butterfly Valve on the back side of the Air Circuit is used (via linkage to the Treadle) to control the volume of air passing through the Air Circuit.

This valve, by controlling the volume of air passing through the Air Circuit,  controls the cycles per minute (speed) of the ram. 

A second Roller Valve is used as an Air Gate to disable Ram Cycling (when the Treadle is in its fully-up position) in support of the Single-Hit and Clamping features.

When shutting down the hammer, first close the input butterfly valve.  The air circuit has two areas of pressurized air that must be released.  Open the Venting Valve (off the center port of the 4-way valve) to release pressure on the air input side (the cylinder will drop).  The treadle is pressed momentarily to release air trapped in the the exhaust side.

A Muffler is used to reduce exhaust noise.

All  details for each Air Circuit component is discussed in the Long Story.  

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