Push pull operated valve is a type of standard mechanical valve that is activated manually by push pull knob. Push pull operated valves find their application in the systems were manual control is needed for the actuation or deactuation of pneumatic actuators such as cylinders, gripers etc. Pneumatic push-button valves are used to signal other pneumatic devices within a system manually; they are available with a variety of push-button operators including mushroom, flush, shrouded and knob type buttons available in red, green or black. Mushroom buttons have a large contact area exposed beyond the panel surface that provides for quick and easy palm operation; they are particularly useful for repetitive processes where a robust button is necessary. Punch buttons latch when operated; a twist action releases it from a detented position, typically used for emergency stop applications on production lines and only when they are released can a process resume. Shrouded type push-buttons have a reduced contact surface that enables only a single finger or thumb to operate the button; they are low-profile by design, the bezel not only compliments panel appearance but also protects the valve against accidental operation. Knob type push and pull operators are raised above the panel surface; this allows the valve to be operated both directions by hand. A 5/2 way directional valve from the name itself has 5 ports equally spaced and 2 flow positions. It can be used to isolate and simultaneously bypass a passage way for the fluid which for example should retract or extend a double-acting cylinder. There are variety of ways to have this valve actuated. A solenoid valve is commonly used, a lever can be manually twist or pinch to actuate the valve, an internal or external hydraulic or pneumatic pilot to move the shaft inside, sometimes with a spring return on the other end so it will go back to its original position when pressure is gone, or a combination of any of the mention above.