Tryckcylinders

Tryckcylinders, or pressure cylinders, are devices that convert pressurized fluid into linear motion. In practice the term covers hydraulic cylinders that use a liquid under high pressure and pneumatic cylinders that use compressed air or other gases. Both types consist of a cylindrical bore, a piston, a piston rod, end caps, seals, and ports for fluid ingress and egress. The enclosure provides a sealed chamber where pressure is applied to move the piston against a load.

A piston divides the bore into two chambers. In a single-acting cylinder, pressure moves the piston in one direction and an external force or a spring returns it. In a double-acting cylinder, pressure can move the piston in both directions, with separate ports for extension and retraction.

Performance depends on bore size, stroke, fluid pressure, and efficiency of seals. Force at the piston is F = P × A, where P is the operating pressure and A is the piston area. Pneumatic cylinders typically operate at lower pressures (for example several bar up to about 15 bar) and are suited for fast, light-duty motion, while hydraulic cylinders operate at higher pressures (tens to hundreds of bar) and deliver greater force. Seals and rod coatings affect longevity and speed.

Common mounting configurations include tie-rod, welded or integral end caps, and various rod-end attachments such as clevis or eyelets. Standards and interfaces vary by manufacturer, with ISO and other regional standards governing dimensions and mounting patterns for compatibility in automation systems.

Applications span manufacturing automation, clamping, lifting, and material handling. Proper selection considers load, speed, duty cycle, lubrication, and maintenance to ensure safety and reliability.