MANUFACTURE OF FIBER REINFORCED PLASTIC VALVE BOX FOR BUTTERFLY VALVE

PURPOSE:To improve strength of a hole peripheral part for a valve stem by setting up each cloth impregnated with a thermosetting resin material before its press forming, in a position equivalent to the circumference of the valve stem hole. CONSTITUTION:Prior to press forming, each cloth 7 impregnate...

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Bibliographische Detailangaben
1. Verfasser:	KAKEHASHI KOICHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	ACTUATING-FLOATS AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING BLASTING COCKS DEVICES FOR VENTING OR AERATING ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS LIGHTING MECHANICAL ENGINEERING PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TAPS THERMAL INSULATION IN GENERAL TRANSPORTING VALVES WEAPONS WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	PURPOSE:To improve strength of a hole peripheral part for a valve stem by setting up each cloth impregnated with a thermosetting resin material before its press forming, in a position equivalent to the circumference of the valve stem hole. CONSTITUTION:Prior to press forming, each cloth 7 impregnated with a thermosetting resin material is set up in a position equivalent to the surroundings of valve stem holes 4, 5 in an inner surface of at least a valve box 1 whereby the cloth 8 is solidly formed an and around these valve stem holes 4, 5 in the valve box inner surface. When the valve box 1 suchlike is actually used, even if stress concentration is produced in each peripheral part of these valve stem holes 4, 5 by what water pressure acts on a valve stem 3, since the cloth 8 is solidly formed on an inner surface of the valve box in respective peripheral parts of the valve stem hole 4, 5 being in a most dangerous state or a possible cause of crack occurrence, any occurrence of a crack or the like is obviable owing to reinforcement action to a two-dimensional direction at valve stem shaft center directional view most efficiently and effectively.