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I have been designing a hydraulic hole punch circuit looking at what was previously done I came across this symbol I have never seen before and have mixed feelings on what it is doing. I have been looking to potentially eliminate the extra component to make the hole punch design simpler. Is it feasible to eliminate the symbol pictured in figure 1 and not loose any functionality of the hole punch? Also what is this symbol doing?

Figure 1: This is the symbol in question for the hydraulic circuit

Here is what I think it may be

  1. A counter balance on "A"
    Opposition: The hole punch weighs roughly 1 kg where as the cylinder is much larger so why would a counter balance be needed? Do all gravity affected movements need a counterbalance?

Specs for the cylinder
23.8 GPM EXTEND (90.4 L/M)
25.0 GPM RETRACT (73.8 L/M)
STROKE VELOCITY 11.9 FT/MIN (3.6 M/MIN)
7.00" BORE (152.4MM) 10.62" STROKE (273.05MM)
3.00" ROD (76.2 MM)

  1. Metered flow component with a check valve
  2. Pressure Relief Valve

This is the hydraulic hole punch circuit (P) Pressure is on the left most side and (T) Tank is left of B

References: Symbols
More Symbols

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  • $\begingroup$ I am told this is a counter balance now building this in a lab is quite interesting I have seen no difference with or without the counter balance the cylinder simply punches a hole in sheet metal. I am an EE so maybe there is something I am missing. Everything here is supplied by Parker Hannifin in the schools lab. $\endgroup$
    – David Wisniewski
    Aug 26, 2022 at 1:47

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