Group: EATON Airflex
Catalog excerpts
Quick Release Valve Description Description The Airflex quick release valve (QRV) is a pneumatic in-line, three-way valve designed to automatically close upon pressurization and open to exhaust when a pressure drop occurs in the supply line. The valve provides an exhaust port close to the pressurized chamber of the device being controlled rather than exhausting through long supply lines and/or control components. The end result is a reduction in lag time between the signal to exhaust and response. The benefits derived include: • Faster cyclic rates • Reduction or elimination of overlap • Reduced wear of drive components Four basic valve sizes are available, identified by the American National Pipe Thread on the cylinder port: 3/8, 1/2, 3/4 and 1. Models are available with inlet ports suitable for either pipe or tubing connections. Mufflers are also available to reduce exhaust noise. Quick release valve sizes 3/8, 1/2 and 3/4 utilizes a diaphragm in their design. Air pressure, at the inlet, seats the diaphragm on the end cap, closing the exhaust port. Pressure on the outer unsupported diaphragm area causes it to deflect, allowing air to flow to the cylinder port. When a pressure drop occurs in the air supply, the pressure differential lifts the diaphragm from the exhaust port and seats it on the inlet port. Air from the pressurized device can now flow freely to atmosphere through the exhaust port. The 1 quick release valve utilizes a plunger in its design. The spring-biased plunger is guided during its travel by the fit between its stem and the house. When sufficient pressure is developed on the stem’s diametrical area to overcome the spring force, the plunger shifts, seats on the seal washer closing the exhaust port. The unbalance in the exposed plunger pressurized area favors the inlet side; thereby, keeping the exhaust port closed. Air flows through the radial holes in the stem to the cylinder port. When a sufficient pressure drop occurs on the inlet side of the plunger, the spring force shifts the plunger, opening the exhaust port and blocking the inlet port. Air is now free to flow from the cylinder to exhaust. Blockage of the inlet forces the air in the supply line to exhaust back through the control valve. Inlet Exhaust Cylinder Plunger Spring Seal Washer Inlet Exhaust End Cap Diaphragm Valve Pressurized Cylinder Valve Open to Exhaust Inlet Exhaust Inlet Side Exhaust Side Cylinder Valve Pressurized J - 19 Cylinder Valve Open to Exhaust Plunger Pressure Unbalance for Closed Valve Copyright Eaton Corporation, 1997, All rights reserved.
Open the catalog to page 1Quick Release Valves Component Part Descriptions Diaphragm Type Valve 5 2 1 4 3 Plunger Type Valve 1 8 9 10 12 11 3 Item Description Item Description 1 End Cap 8 Seal 2 Diaphragm 9 Spring Rubber Sleeve 10 Washer Metal Sleeve 11 Plunger 4 Pipe Adapter 12 Cushion 5 Muffler 3 Copyright Eaton Corporation, 1997, All rights reserved. J - 20
Open the catalog to page 2Quick Release Valves Forms QRV 909 & 910 Technical Data Technical Data for Diaphragm Type Valve Maximum operating pressure: 150 psi (10,3 bar) Minimum sealing pressure: 2 psi (0,14 bar) Air quality: Clean and dry to avoid contamination of housing and diaphragm. Any additive used in air supply must be compatible with valve materials. Inlet Port Options American National Pipe Thread Size Cylinder Port American National Pipe Thread Tubing Outside Diameter (in) 3/8 3/8-18 0.500 3/8-18 1/2 1/2-14 0.625 1/2-14 3/4 3/4-14 0.750 3/4-14 1-11 1/2 1.000 1-11 1/2 1 Operating temperature range: -40oF...
Open the catalog to page 3Typical Applications Propel Clutch Swing Clutches Dual Passage Rotorseal A dual passage rotorseal supplies air to the swing clutches on this power crane shaft assembly. A single passage rotorseal (not shown) on the opposite shaft end supplies air to the propel clutch. Air Receiver Tank Solenoid Valve Rotorseal QRV Four QRV’s are used to exhaust a pneumatic clutch, which is mounted to the inside bullgear web, in this punch press drive. J - 23 Copyright Eaton Corporation, 1997, All rights reserved.
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