Hi am Mohamed i would like to get details on fabrication of cam operated valve ..My friend Justin said fabrication of cam operated valve will be available here and now i am living at ......... and i last studied in the college/school ......... and now am doing ....i need help on ......etc
Posts: 14,118
Threads: 61
Joined: Oct 2014
A cam valve (or more properly, a cam-actuated valve) is a directional control valve, and is available for both air and hydraulic operation. For air service, 2-way, 3-way, and 4-way cam valves in sizes up to 1-inch are available. For hydraulics, most cam valves are 2-way, either normally open (N.O.) or normally closed (N.C.), but are not generally available larger than 1/4 or 3/8-inch size. However, as shown in these circuits, they can be used to pilot larger valves.
For applications like those described here, in which the action takes place at an exact position of the cylinder piston rod, a cam valve may be used in preference to a limit switch because, being mechanically actuated, it is more reliable and will repeat every cycle to a greater accuracy. Also, it is not dependent on the presence of an electrical power supply.
Cylinder Deceleration
Figure 1. Small Cylinder. The cam valve is located near the end of the cylinder stroke to reduce the speed of travel before impact of the piston against the cylinder end cap.
During the forward stroke a free-flow path is provided through the cam valve for oil leaving the cylinder, and travel speed is a maximum. When the cam valve is actuated, the discharge oil is forced to go through the variable restrictor (needle valve) and speed is reduced.