Seven Features of the Koganei Vacuum Valve

Transcription

1 Seven Features of the Koganei Valve Koganei Original Solenoid Construction No burning damage to solenoid No need to stock solenoids as spare parts. Starting and energizing current values are extremely small. Allows for more compact size peripheral electrical equipment. Poppet and Diaphragm Construction No sliding parts No valve sticking, for reliable operations. Extremely few cases of vacuum leakage Good vacuum response enables excellent pick-up by a vacuum pad and compact vacuum pump to install. Dust-resistant Can be used by installing just an ordinary air filter, even in dusty locations. Can be used without lubrication. Optimum valve for equipment incapable of using oil. Compact and lightweight, with any mounting direction acceptable Can be easily mounted to control panel, and allows for more compact equipment. Application Examples Opening bags Quick charging of liquids Paper feeding for printers Bag Liquid Container Paper pad forming machines Discriminating product facing Labeling on cardboard boxes Plastic seat Heater Output signal Mold Work switch Detector Label Cardboard box Right side up Right side down 957

2 AC Solenoid (General) Half-wave Rectification Solenoid (Koganei) Koganei s ingenious self-developed solenoid Current Armature Solenoid Starting current Energizing current Time Current wave form in an abnormal condition. Burn out will occur. Abnormal condition: when the armature is not attracted. Current Armature Solenoid Starting current Energizing current Time No burn out will occur even in an abnormal condition due to identical wave A silicon diode is installed on the end of the solenoid for half-wave rectification of the alternating current. The solenoid, therefore, possesses midway characteristics between the AC solenoid and DC solenoid. In addition, since the armature is designed to move as short a distance as possible, the starting current (inrush current) and energizing current are virtually identical and low current. As a result, the solenoid is not damaged even in abnormal conditions in which the armature fails to move, and the capacity of related electrical equipment can remain low. Poppet Electromagnetic force Pilot air Diaphragm External force Stem Wrapped in foreign objects Diaphragm Foreign objects Body Poppet and diaphragm construction The synthetic rubber poppet and diaphragm are built into the stem and move as one-piece. The poppet and diaphragm do not have any sliding surfaces, therefore no sticking occurs even without lubrication. In addition, the units have the elasticity of synthetic rubber to wrap in small foreign objects and keep vacuum leaks to an extremely low level. lifting Reducing sheet transfer time (both vacuum and positive pressure) Tape speed controlling Magnetic head operated non-operated Tape Plate glass pump pressure Sheet pressure Work brake Tape reel Holding subject (sheets) Subject (sheet) Camera Inducing gas into analyzers Gas C Gas B Analyzer Gas A tightness inspecting Manometer Scale Tested object 958

3 <Product Range> Products Shape Operation type Port size Rc Effective Port Function area Cv Model mm 2 Page Solenoid vacuum valve Single solenoid Double solenoid (Continuously energizing type) Direct acting Indirect acting External air pilot Indirect acting External vacuum pilot Indirect acting External air pilot 2, 2 NC 0.76 NO NC/ NO V062E1 SV062E1 (Both vacuum and pressure type) V126E1 VA250AE1 VA250AE1 E1 VV250AE1 VV250AE1 E1 VA250AE2 VA250AE2 E Manual vacuum valve and foot vacuum valve Push button Lever Foot Spring return With holding mechanism Holding type Pedal type 2, 5 2, NC NC/ NO NC V125P V250P V250P V125HO V125V V250V V250V V250-4H V250-4H V250F 970 Mechanical operated vacuum valve Roller-cam Ball-cam Nylon roller Steel roller One way steel roller 2, NC NC V125B V250B V250B V250C V250C V125MC V125MOC Piloted vacuum valve pilot (single) pilot (single) Double air pilot /4 2, NC NC/ NO VA250A VA250A VV250A VV250A 250A2 250A2 500A2 750A A2 959

4 Safety Precautions (Solenoid Valve Series) Warnings Caution Attention 1. When mounting a valve inside a control panel or when an operation requires long energizing periods, provide heat radiation measures to ensure that the ambient temperature always remains within the temperature range specifications. For long term continuous energizing, consult us. 2. Always check the Catalog, etc., when carrying out wiring and piping of products to ensure that the connections are correctly done. Wrong wiring or piping could result in abnormal operation to the actuator, etc.. The solenoid valve s silicon diode could be damaged by surge voltage when a large induction load is used on the same power supply. Either change to a separate power supply, or mount a surge absorber to protect the unit. Solenoids with surge suppression are also available. Consult us. For locations subject to water or to large amounts of dust, use a cover, etc., to protect the valves. Also, install a muffler, etc., to the R port to prevent dust from entering. Intrusion of water or dust could result in short-term functional shutdowns, sudden drops in performance, or a reduced operating life. 1. Use clean air that does not contain degraded compressor oil, etc., and install a filter, etc., close to solenoid valves to remove dust or collected liquid. 2. Ensure that the piping port on the supply side is at the same area or larger than the solenoid valve s effective area.. When using an indirect acting valve, use a stop valve between it and the pressure source. When the stop valve is opened before the pressure reaches the minimum operating pressure, the indirect acting valve could fall into a neutral position. (All solenoid valves in the 250 series and up are indirect acting valves.) 4. When connecting 2 or more AC type solenoid valves to the same power supply, connect leads with the same lead wire color. 5. Since a diode is connected to the AC type solenoid valve, the solenoid may sometimes not turn on with the solid state-type relay (SSR) with zero-cross function. For this reason, pay attention before use to the ratings and precautions for use of the solid state-type relay. Voltage Types and Current AC Rated voltage V 50Hz Current A Note 60Hz Note: The starting current and energizing current values are virtually identical, and fall within these values. Rated voltage V Current A DC For items, consult us for the delivery. Wiring Instructions of Double Solenoid (E2 )Type This valve has 2 solenoids built into the top and mid section, and the lead wires are color-coded with vinyl tape. Energizing the red tape side (the upper side, solenoid S2) opens the valve, and energizing the gray tape side (the lower side, solenoid S1) closes the valve. This solenoid is a continuous energizing holding type. Solenoid S1 energized Solenoid S2 Red tape Gray tape Solenoid S1 Poppet Armature Pilot air 960

5 Piloted Valves Single Pilot Type Specifications Basic model Item Media Operation type Number of ports Valve function Effective areacv mm 2 Port size Rc Lubrication Operating pressure range kpa {mmhg} [in.hg] External pilot pressure Operating temperature range C [ F] Mounting direction Mass kg [lb.] VA250A VA250A VV250A VV250A pilot ports (Cannot be used as 2-port and normally open (NO) in terms of construction) Normally closed (NC) Not required 0100 {0750} [029.5] } [ ] Recommended air pressure 0.20.MPa [2944psi.] MAX. 0.7MPa [102psi.] Recommended air pressure 0.20.MPa [2944psi.] MAX. 0.5MPa [7psi.] 560 [41140] Any pilot 51100MPa {80750 (mmhg)} [ in.Hg] 0.08 [0.18] 0.17 [0.7] 0.22 [0.49] 0.45 [0.99] 0.17 [0.7] 0.2 [0.44] 0.45 [0.99] Order Codes -port Basic model Option Mounting type With lock nuts for panel mounting -22 pilot pilot -port -port -port -port -port -port VA250A VA250A VV250A VV250A Blank: Base mounting type 976

6 Operating Principles and Symbols Normal condition Operating condition Pilot air OFF Pilot air ON Atmosphere port connection port Atmospheric pressure R(atmospheric pressure) P(vacuum) connection port R(atmospheric pressure) P(vacuum) VA250A VA250A Normal condition Operating condition Pilot vacuum OFF Pilot vacuum ON connection port connection port P(vacuum) R(atmospheric pressure) Atmosphere port P(vacuum) R(atmospheric pressure) VV250A VV250A Dimensions (mm) Wrench flats width Pilot connection port With lock nuts for panel mounting (Order code: -22) 977

7 Dimensions (mm) VA250A VA250A Wrench flats width Pilot connection port Dimensions in parentheses ( ) are for the VA250A. Wrench flats width Pilot connection port places Wrench flats width Pilot connection port VV250A VV250A Wrench flats width Pilot connection port Dimensions in parentheses ( ) are for the VV250A. 978

8 Reference Valve Selection Table (Exhaust and Supply Response Times) kpa [in.hg] Model V062E1 V126E1 VA250AE1 E1 1000A2 50cc [.05in. ] chamber 200cc [12.2in. ] chamber 1R[61in. ] chamber R[18in. ] chamber 5.5R[6in. ] chamber 10.5R[641in. ] chamber Exhaust Note supply Exhaust supply Exhaust supply Exhaust supply Exhaust supply Exhaust supply [24.01] [12.58] [24.01] [12.58] [24.01] [12.58] [24.01] [12.58] [24.01] [12.58] [24.01] [12.58] 0 0 [24.01] [12.58] 0 0 [24.01] [12.58] 0 0 [24.01] [12.58] 0 0 [24.01] [12.58] The above table shows the time it takes from the point in time where the vacuum valve is switched ON to reach the specified vacuum inside of the chamber, and the time from switching the vacuum valve OFF to supply air into the chamber. Note: The exhaust vacuum in the chamber is a 80% rating value of the vacuum inside of the primary tank. M Cock gauge R P Primary tank (120R [4.24ft. ]) Oscilloscope Chamber By using the cock to set the vacuum inside the primary tank to 101.kPa [29.92in.Hg] or 5.kPa [.74in.Hg] [24.01] [12.58] [24.01] [12.58] 0 0 s Standard Circuit Muffler Calculation of Picking-up Force, and Graph (Theoretical values) When using a vacuum pad to hold picking-up an object, the pickingup force is shown by the following formula. Motor switch Filter gauge Filter Strainer 2-port solenoid valve -port solenoid valve storage tank Inspection Standard for Leaks (Koganei standards) WPA0.1 W: Picking-up force (N) P: (kpa) A: Pad area (cm 2 ) <Conventional units> p' W' 1.0A' 760 W': Picking-up force (kgf) P': (mmhg) A': Pad area (cm 2 ) Operating vacuum Picked up object P vacuum pump p'' W'' 14.7A'' W'': Picking-up force [lbf.] P'': [in.hg] A'': Pad area [in. 2 ] kpa {mmhg} [in.hg] Inspection procedure Open valve A, and set the vacuum in the tank to 100kPa {750mmHg} [29.5in.Hg]. Afterward, close valve A, let set for 10 minutes, and then check the vacuum inside of the tank both during OFF and ON. Inspection standard Let set for 10 minutes, then check to see that the vacuum leaks inside the tank meets the standard of 1.kPa {10mmHg} [0.8in.Hg] or less. For details, consult us. Remark In fact, most Koganei vacuum valves can hold initial vacuum even after being left set for 10 minutes. Inspection circuit when vacuum valve is OFF 98.7kPa gauge Max. 740mmHg [ 29.1in.Hg] 100kPa 0 750mmHg [ 29.5in.Hg] A Inspection circuit OFF R A P Inspected Tank vacuum valve 85cm [5.19in. ] Inspection circuit when vacuum valve is ON gauge 98.7kPa Max. 740mmHg [ 29.1in.Hg] 100kPa 750mmHg [ 29.5in.Hg] A Tank 85cm [5.19in. ] R P ON A Plug Inspected vacuum valve Picking-up force 9. {700} [27.56] 80 {600} [2.62] 66.7 {500} [19.69] 5. {400} [.75] 40 {00} [11.81] 26.7 {200} [7.87] 1. {100} [.94] area How to read the graph When the vacuum is 66.7kPa [19.7in.Hg], and the vacuum pad area is 176.6cm 2 [27.7in. 2 ], the picking-up force is 1178N [265lbf.]. 982

9 Reference How to Use Both and Pressure Type (SV062E1) De-energized Energized 0100kPa [029.5in.Hg] 00.7MPa [0102psi.] 0100kPa [029.5in.Hg] 00.7MPa [0102psi.] Sheet Application of External Pilot Type (VA250AE1/ VA250AE1/ E1) Energized De-energized Pilot air Pilot air Sheet Note: Use as P1 2P2. Application of External Double Pilot Type (250A2 / 500A2, etc.) Pilot air ON Pilot air OFF Sheet Pilot air OFF Pilot air ON Note: Use as P1 2P2. Pressure Unit Comparison Table Absolute vacuum () Atmospheric pressure (Positive pressure) kpa gauge pressure (mmhg) (negative mercury) [Example] 76kPa190Torr190mmHg Torr mercury (Torr=mmHg) rating VAC) Millibar (mbar) Absolute pressure (kgf/cm 2 abs) Gauge pressure (1bar1kgf/cm 2 G)