Frequently Asked Questions

Schrader Duncan Limited was renamed as Duncan Engineering Limited w.e.f. 01.12.2016

Ans: Yes, these are classified under Specialty products and can be found using the online catalogue.

Ans: Schrader Offer a wide range of air cylinders; please use the online catalogue to browse our product range.

Ans: Some applications require very long stroke cylinders. If there is a compressive axial load applied to the piston rod, care must be taken to ensure that the system parameters of rod length, diameter and load are within the safety limits to prevent buckling. In this case while manufacturing Cylinder Provided with stop to preventing.

Ans: Cushioning protects a cylinder and load by absorbing the energy at the end of stroke. This results in progressive deceleration and gentle contact between the piston and end cover.

Ans: Bellows is used for to protect dust on piston rod

Ans: Used for turning components, operating process valves, as they can provide angular rotation up to 90 degrees.

Ans: As they use compressed air to power both the outstroke and the in stroke, superior speed control is possible. Double Acting cylinders include Non-cushioned, and Adjustable cushioned types.

Ans: They have a power stroke in one direction only with a spring, gravity or other external force to return the rod.

Ans: Datasheets are available on the Website Find the product you are looking for, and click on the link. For example, VDMA Contact cylinders

Ans: 14"which is available to order, & Next range Regional Sale Manager or Marketing Dept.

Ans: Yes, cylinders and mountings, ball valves and air service units.

Ans: Yes, VDMA24562, ISO6431 and from 12mm to 200mm bore. Also. A brand of Compact Cylinder interchangeable with other brands.

Ans: Please contact us and we'll be happy to advise you of the most suitable equivalent for your application. When selecting an equivalent there are many features that may have to be taken into consideration these include: function, conformity to a standard, port connections, envelope size, orientation, performance, duty, materials of construction, pressure rating and power rating.

Ans: You can use a 5 port, 3 position valve which has a closed centre position. This will stop the cylinder in a mid position however the positional accuracy of using this method is not good. And Other method is using positioner to control cylinder stroke with respect to input signals.

Ans: By using flow regulators or speed controllers to control the exhausting air from the cylinder thus reducing the speed.

Ans: The maximum for cylinders with standard seals is 80°C. For cylinders with Viton seals it is 180°C.

Ans: This depends on the air pressure applied to the cylinder piston.

Ans: No, they need to be ordered separately. But these cylinder to be called as reed switch operated Cylinders.

Ans: This depends on mounting and loading style.

Ans: Yes, we can make a cylinder to order in any stroke length you require up to a design maximum.

Ans: Most Schrader cylinders and valves are designed for use in non-lube operation. Airline lubrication however will increase the service life. If lubrication is used, it must be maintained for the service life of the product.

Ans: ISO stands for International Standards Organization an International body which formulates various standards which equipment should conform to allowing for interchange of products between manufacturers.

Ans: At very slow speeds hydro-pneumatic control is recommended.

Ans: Use two cylinders of the same stroke, joined back-to-back or rod-to-rod and operate by individual control valves.