In addition, the system has a safety hydraulic relief valve in the manifold
which protects the shear against overload. The valve is set at 3,000 or
4,000 p.s.i. and shunts hydraulic fluid to the tank if the knife is unable
to shear the plate.
When the shear is running, the fluid is filtered through a suction screen
inside the reservoir and through a micronic filter mounted on the tank
top giving continuous filtration. The two main hydraulic cylinders are made
of honed seamless tubing, and mated with high quality chrome plated
cylinder rods for minimum service.
Hydraulically-powered holddown clamps, made of induction hardened and
chrome-plated cylinder rods, are spaced on 8" centers along the entire
cutting length of the shear. Close spacing provides sufficient force to
prevent movement of materials, as well as twisting or bulging of light gauge
metals between the holddowns during the shearing process.
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