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LAPPING VALVE SEATING SURFACES By Leland C. Brown, Jr. 10. Select the finer compound (500 grit or 900 grit) ... mately 1 inch beyond the surface edge of the lap. Then, invert the lap and place it flat onto the nozzle ... Keep the following in mind when lapping valve discs or nozzle seats: • Discs typically require lapping with 320 grit, 500 ...
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Apr 10, 2018· I just had new valve seats professionally installed by a machine shop and I have a new set of valves ready to go in. Is lapping necessary with new seats and valves? Or is lapping just an old archaic process usually reserved for well-used / pitted valves and seats?
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valve grinding & lapping machines Lightweight for easy handling and installation, our valve grinding and lapping machines span working ranges for gate valves from 1.3 to 39.4 inches (32 to 1000 mm). During operation, you can quickly change grinding disks and adjust the grind pressure.
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(Example: A 6" globe valve is allowed to leak 60 cc/hr in a test) Check valves: 40 cc/hr per inch of nominal pipe diameter; All shutoff or isolation valves specified to MSS-SP-61 must pass the above standards. The seat closure test must be performed at a fluid (liquid or gas) pressure no less than 1.1 times the 1000°F (380°C) rating rounded ...
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Dec 19, 2015· This video shows how you can quickly and efficiently lapping all kind of valves using high quality paste. All describtion about this product you can read on my listing on Ebay and also to buy it ...
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I always thought lapping was a quick re-seating job for valves and seats already in good shape, or that have been freshly cut and need to be ground to match the valves precisely. Don't know, but if your guides, valves, and/or seats are worn out, it's probably not going to help a whole lot and you should get some valve work done at a shop.
Sep 30, 2011· 3- the real test of valve seats is called a LEAKDOWN TEST. Lapped valves on uncut seats tend not to pass this. A fresh valve seat and ground valve will. 4- a properly cut seat and valve do not require lapping to seal. 5- valve lapping is still performed, primarily to verify concentricity and contact location on the valve.
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