Ratermann Manufacturing, Inc. Customer Service 1-800-264-7793 y Fax 1-800-264-7797 y Order Online at Web Store www.rmiorder.com 34A-40 POST MEDICAL VALVES KVAB SERIES WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov S H E R W O O D M A S T E R D I S T R I B U T O R REPAIR INSTRUCTIONS FOR KVAB SERIES MEDICAL VALVES DISASSEMBLY OF VALVE 1. Place the valve assembly into a vise or similar holding fixture, taking care not to damage the inlet or outlet threads. The holding fixture must securely grip the valve body on the wrench flats so that no damage is done to the internal bores, external threads, outlet, or pressure relief device. 2. Remove any handwheels, toggles or other opening devices that are affixed to the valve stem per the instructions below. a. To remove a toggle lever, press the pin out using a press. Remove the toggle lever from the stem. b. To remove a handwheel, use a straight blade screw driver to lift both retaining ears on the hand wheel and pry the handwheel off. 3. Chamber a. Using a 13/16 socket or hex box wrench, remove the bonnet by turning it counter clockwise. b. Remove the copper gasket, being careful not to scratch the gasket sealing surface on the valve body. c. With the upper stem still in place, turn the upper stem counter clockwise to loosen the lower plug. As the lower plug is loosened, it will rise in the chamber and will push out the spring. Remove the spring as well as the lower plug. d. Remove the o-ring, back-up rings and packing from the stem. 4. Pressure Relief Device (PRD) a. Remove the PRD by turning it counter clockwise using the tool indicated below. b. If the plug is slotted, use the proper size straight bladed screw driver. c. If the plug is internal hex broached, use a 3/16 allen wrench. d. If the plug is an external hex, use a 3/8 hex box wrench or socket wrench. e. If the plug is Torx broached, use a Torx #30 driver. f.. If the rupture disc and the gasket remain the valve body after the plug is removed, use a sharp pointed instrument inserted through the CENTER of the rupture disc and carefully pry up to remove them from the valve body. Do not damage the sealing surface on the valve body. INSPECTION OF VALVE AND COMPONENTS 1. Valve Body a. Inspect the valve body chamber bore for dirt, debris or damage. Where possible, blow out the valve body chamber using clean, dry, Compressed Air or Nitrogen to remove any foreign particles. b. If the valve body is damaged, do not attempt to repair. Order a new valve assembly. 2. Components a. Inspect the bonnet for damage to the threads, sealing surfaces, and plating. If damaged, replace the bonnet. b. Inspect the copper gasket for damage and replace if necessary. c. Inspect the spring for damaged or cracked coils and replace if necessary. d. Inspect the stem shaft and square for straightness. If the stem is damaged, twisted or bent, replace the stem. Inspect the top side of the stem shoulder where the packing seals. If there are any signs of damage to this shoulder area, replace the stem. Look for cracks or separation in the area where the shoulder meets the stem. If a crack or separation is found, replace the stem. e. Always discard and replace the lower plug, o-ring, back-up rings and packing. f. Always discard and replace the PRD. ASSEMBLY OF VALVE NOTE: The KVAB Medical Valves are used in the medical industry and in oxygen saturated environments. All part must be clean, free of oil, chips and other contaminant particles before beginning assembly. Contaminant particles can ignite in the presence of oxygen. Check all plated parts before and after assembly to make sure they are completely plated and that they are not chipped or scratched. NOTE: KVAB Medical Valves require no lubrication on any internal components except the stem o-ring and the copper gasket. The lubrication used on these parts MUST be oxygen compatible. Sherwood recommends the use of Christo-lube® MCG111, Fluorolube® GR362, Krytox® 240AB or an equivalent lubricant. 1. Chamber a. Install the new lower plug into the valve chamber with the square hole facing up and the seat down. Using the stem as a driver, screw the lower plug into the valve chamber by turning it clockwise, until fully seated. Do not use a wrench to install, as over-tightening will damage the seat in the lower plug. Remove the stem from the valve chamber. b. Place the spring into the square hole of the lower plug inside the valve assembly. c. Place the bonnet and stem assembly, with the round side of the stem down, into the valve chamber through the top of the spring that is inside the square hole of the lower plug. Once the round portion of the lower stem is inserted into the spring, make sure that the square drive portion of the lower stem is inserted into the square hole of the lower plug. d. Install a new, lightly lubricated copper gasket on top of the valve, making sure it is properly seated into the gasket recess. e. Using a 3/16 socket and a calibrated torque wrench, tighten the bonnet to 25-30 ft. lbs. f. To ensure free and smooth operation, open and close the valve several times, by turning the stem. Medical Post Valves KVAB Series: Repair Instructions
