Valves with spool and sleeve assembly
The spool and sleeve assembly is a matched set consisting of a stainless steel spool assembled into a stainless steel sleeve. The steel used is a 440C stainless hardened to 62 Rockwell „C“. The tolerance is such that air is entrained between the spool and sleeve forming an „airbearing“ effect which ensures safe, wear-free operation with extremely short cycles and low shift forces. At the same time reliability of the spool and sleeve assembly is maintained both for lubricated and non-lubricated air. Under both sets of conditions the spool moves with minimal friction leading to very low shifting forces enabling quick response. The hardness of the spool and sleeve ensures no damage from pipe scale or other airline contaminants while the stainless steel construction combats any line moisture. these features will allow a typical service life in excess of 200 million cycles. The spool is balanced with respect to air pressure and coupled with the absence of wearing parts allows extreme versatility of valve applications. The air can flow in any direction at any pressure or vacuum. This unique design enables cylinder working strokes at one pressure while unloaded reverse strokes can be carried out economically at low pressures. Valves that contains spool and sleeve assembly are marked with this designation: |
We make the spool and sleeve assembly from hardened stainless steel. The technical interest is that thanks to the precise grinding and honing of both parts, such accuracy is achieved that the piston in the sleeve moves on the air cushion. This essentially eliminates possible wear and at the same time the piston can be moved very easily and very quickly. The clearance is so small that there are no leaks even without a seal. |