E Catalogue

41 NEEDLE VALVES 7021233 (741MD-SS Valve) Fluid body is passivated 303 stainless steel. Air cylinder body assembly is hard-coat anodized aluminum. Includes fluid inlet fittings #7021499 and #7007038. 7015585 (741MD-SS-BP Valve) Fluid body is passivated 303 stainless steel. Air cylinder body assembly is hard-coat anodized aluminum. Includes fluid inlet fittings and BackPack valve actuator #7015581. MicroDot ™ Valve 741MD-SS The MicroDot valve is a pneumatically operated adjustable needle valve designed to apply very precise deposits down to fractions of a microliter. Ideal for automated assembly processes, the 741MD-SS valve has an adjustable needle stroke with a unique calibration feature that allows the user to maintain exact deposit size. Features and Benefits • Zero dead fluid volume • Easy calibration; short setup time • Consistent microdots as small as 0.18 mm (0.007") diameter • Unaffected by entrapped air in fluids Specifications Size: 127.5 mm length x 26.9 mm diameter (5.02" x 1.06") Weight: 251 g (9.0 oz) Actuating air pressure required: 70-90 psi (4.8-6.2 bar) Maximum fluid pressure: 100 psi (7.0 bar) Fluid inlet thread: 1/8 NPT female Fluid outlet: Luer taper with retaining nut Mounting: 1/4-28 UNF tapped hole Cycle rate: Exceeds 400 per minute Air cylinder body: Aluminum, hard-coat anodized Fluid body: 303 stainless steel Piston: 303 stainless steel Needle: 303 stainless steel Tip adapter: 303 stainless steel EFD SafetyLok ™ collar: Aluminum, hard-coat anodized All stainless steel parts are passivated. Stroke Control Stroke Reference Piston Spring Air Cylinder Body Packing Spring Needle Packings Fluid Body Fluid Inlet 1/8 NPT SafetyLok Collar Piston and Needle Mounting Hole 1/4-28 UNF Needle Seat Disposable Dispensing Tip Tip Adapter Stroke Calibration The ValveMate 8000 allows you to increase or decrease valve open time on the 741MD-SS valve in increments as small as 0.001 seconds. See page 52 . Valves Actuating Air Input 10-32 UNF For use with: Epoxies Lubricants Marking Inks Solvents UV-cure & Light-cure Adhesives The BackPack Valve Actuator mounted on the air cylinder of the 741V Series valve maintains constant pressure at the actuating air inlet, for faster response time without the risk of process variations due to a fluctuating plant air supply or different air line lengths. • High-speed cycle capability. Cycle rates exceed 60-80Hz • Actuation speed as low as 5-6 milliseconds • Smaller deposit size capability due to faster valve actuation speed • Improves process variation for better dot-to-dot consistency BackPack is available preinstalled on new valves, or can be ordered separately (#7015581) to retrofit existing valves. BACKPACK ™ VALVE ACTUATOR