John Larson Posted June 19, 2012 Share Posted June 19, 2012 I'd like to know if the Bull hammer used a 5-port valve with 2-poitions or 3-positions spool. If 3-positions, was it spring centered? A brand and product number off the tag would be fantastic info. Thanks. Quote Link to comment Share on other sites More sharing options...
macbruce Posted June 20, 2012 Share Posted June 20, 2012 Norgren# MNO1CGA23A000 two position.......Parker makes a better counterpart imo. If you like I'll dig up the # Quote Link to comment Share on other sites More sharing options...
ciladog Posted June 20, 2012 Share Posted June 20, 2012 The valve used in the Bull hammers (original and new design) Two-pressure-output (4 Way) Valve with Five Ports and Two Positions This is not spring loaded. The original design uses two (3 port) pilot control valves to control the spool and the new design uses one (5 port) control valve to control the spool. Quote Link to comment Share on other sites More sharing options...
Sam Salvati Posted June 20, 2012 Share Posted June 20, 2012 Man those old Bull style hammers are cool. Quote Link to comment Share on other sites More sharing options...
macbruce Posted June 20, 2012 Share Posted June 20, 2012 This Parker counterpart is sold a MSC.........Description: Stacking Solenoid Valves; Type: 4-Way Body Ported Valve; Actuator Type: Double Air Pilot; Number of Positions: 2 Position; Valve Type: 4-Way; Return Type: Pilot; CV Rating: 5.900Add To Cart Add to List Email To A Friend Print this page MSC #: 09687419 Order Qty of 1 = (1) Unit Your Price: $142.95 ea In stock: 6 Mfr: Parker Hannifin Mfr #: B743000XXA Qty: Quote Link to comment Share on other sites More sharing options...
John Larson Posted June 20, 2012 Author Share Posted June 20, 2012 Thanks guys. This is a great site to be able to access folks such as you. Ciladog, clarification please. I assume you mean that you have changed from the two roller valves shown on each side of your telescoping rod-cam to a single roller valve with one air inlet, two ports to feed the spool valve at each end of the spool valve, and two exhaust ports. How did you rig this up? I can't tell for sure whether you mean that or that you have set up the spool valve as sketched and photographed. Also, are you running different air pressures on each side of the cylinder piston? Quote Link to comment Share on other sites More sharing options...
ciladog Posted June 20, 2012 Share Posted June 20, 2012 Thanks guys. This is a great site to be able to access folks such as you. Ciladog, clarification please. I assume you mean that you have changed from the two roller valves shown on each side of your telescoping rod-cam to a single roller valve with one air inlet, two ports to feed the spool valve at each end of the spool valve, and two exhaust ports. How did you rig this up? I can't tell for sure whether you mean that or that you have set up the spool valve as sketched and photographed. Also, are you running different air pressures on each side of the cylinder piston? No John, I have not changed the control that uses two control valves. I am saying the new Bull design (cylinder on top) uses the single 5 port control valve and does not have the telescoping control rod. Perhaps someone with an newer designed Bull could post a pic for you. It's one valve that has one roller and is actuated by a lever that is attached to the tup through a simple linkage. The diagram is just standard for the 5 port, 2 position valve. In the picture the two top connections go to each side of the cylinder. The bottom center is air supply and the other two connections on the bottom are cylinder exhaust. The spool control connections are not hooked up in the picture yet but they are the small connections on top at each end of the valve. Reguardless of what type of control used the spool would be connected the same way. The pressures are the same on both sides of the cylinder. Quote Link to comment Share on other sites More sharing options...
John Larson Posted June 20, 2012 Author Share Posted June 20, 2012 Thanks ciladog for the additional information and the clarifications. Your presentation was the first explanation of the Bull that I've seen and it has been useful. Your hand lever control through the top of your valve cabinet is very clever. I share with you great admiration for Tom Troszak's design intellect. Quote Link to comment Share on other sites More sharing options...
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