Startup founder, not a hydraulics person, so this might be a silly one. We monitor a hydraulic lift table at our warehouse: pressure transmitter on the cylinder line, oil temperature, pump running. I’m drawing the process screen in the SCADA designer by copying the vendor’s hydraulic schematic.
One component on the schematic I can’t identify. It sits in the line between the directional valve and the bottom of the lift cylinder. The symbol is a box with a check valve inside (ball and seat) and a spring with a dashed pilot line coming off the other side of the cylinder line, plus a little arrow across the spring. The vendor’s parts list just calls it “CBV-1”. What is it, and what do I put in the drawing for it? I searched the symbol palette for “CBV” and got nothing.
Could it be an accumulator? We have those on our hotel’s booster pumps, they look like a round thing on a line.
No, those are round. This one is square with the check valve inside it and sits directly in the line.
That’s a counterbalance valve (CBV = counterbalance valve). The check valve lets oil flow freely into the cylinder to lift. Coming down, oil has to push past a relief spring, and the dashed pilot line from the other side helps open it, so the load can’t run away or drop if a hose fails. The arrow across the spring means the setting is adjustable. On a lift table it’s the part that stops the platform falling, so it’s worth showing clearly.
On the drawing: the core symbol set has a check valve in the water network family, it’s in every organisation with the SCADA module. I’d place that, label it “CBV-1 counterbalance” with a text, and you’re honest about what it is. The palette search matches names and common other names, so search “check” rather than the part number.
If you want a proper hydraulic/process valve symbol, the Process library covers pumps and valves and ISA instruments. You can browse it before buying: symbols of a locked library show in the palette with a padlock and a still picture. Just see whether one fits before paying. Details: Symbols and industry packs.
Worth putting your pressure transmitter between the CBV and the cylinder on the drawing too, that’s where a dropping load would show first.
Counterbalance valve, got it. Used the core check valve with a label, looked through the Process library with the padlocks and there’s nothing that beats it for our purposes, so no purchase needed. Moved the pressure tag on the drawing to the cylinder side too.
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