Hydraulic Clamping Fundamentals

for clamp time is established with in the restrictions of the largest device, the addition of a flow control will be required to prevent over driving the smaller devices. 14. To provide smoother laminar fluid flow, use a tubing bender and bend the tubing whenever possible instead of using elbow fittings. 15. Do not use flattened, wrinkled or kinked tubing as this will have a negative effect on flow as well as lead to premature failure of the tubing. 16. Do not run tubing in a straight section from one fitting to another, as this does not leave any place for the flexure or expansion of the tube. Provide an expansion loop or bend in the tubing to compensate for changes in temperature, vibration, and expansion. 17. In system designs always try to use as large a line as feasible from power supply to fixture in order to improve the response time and help reduce the backpressure on single acting devices. 18. Do not run hoses straight from port to port. Allow the hose to loop or bend in order to allow the hose to move or swell when pressurized. 19. Do not exceed the manufactures' minimum bend radius on hoses, as rupture or kinking will likely to occur. 13. When considering required clamp time it is important to keep in mind that some devices have minimum actuation time requirements in order to protect the integrity of individual components. If the system flow requirement

22. Do not use an intensifier after a pressure reducing or a pressure-limiting valve. 23. Use a constant displacement pump on intensified circuits. The use of a variable displacement or a two-stage type pump can attribute to erratic intensifier performance. 24. If using an intensifier in a decoupled system, an accumulator needs to be installed between the intensifier outlet and the rest of the system. 25. Consideration should be given as to the location of the power supply relative to the location of the fixture. Every 5 feet of vertical line run will increase system backpressure on single acting devices by approximately two (2) psi. If using directional control valves mounted on a decoupled pallet to control device actuation it is recommended that a “T” port or return check be in stalled on each valve in the circuit, This check valve will prevent accidental actuation of the system from another valve being switched or from the leaking of another system to tank. must be installed in each line to prevent plunger movement. opposing clamps as this will allow the work piece to “float” between them. If this cannot be avoided, a pilot operated check valve 20. When ever possible use a manifold as a distribution point rather than “T” fittings. This will reduce backpressure and improve system response time. 21. When possible, avoid using equal force

Hydraulic Clamping Fundamentals Rev - D

15 of 40

Made with FlippingBook - Online Brochure Maker