CHECK VALVE FOR DRAIN TRAP

• Main Author: HARA KAZUYA
• Format: Patent
• Language: English; Japanese
• Published: 27.05.2021
• Subjects: DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; FIXED CONSTRUCTIONS; SEWERAGE; SINKS; WATER SUPPLY

To provide a check valve for a drain trap that secures a drainage flow rate when the check valve is opened and can exhibit excellent drainage capacity even when the bottom edge of a deodorant pipe extends near the bottom of the drain trap.SOLUTION: A drain trap 1 comprises: a deodorant pipe 4 which is a member that guides into the drainage trap 1 the drainage that flowed from the washing place into a drainage port 2; a bathtub drain pipe 3 that guides into the drain trap 1 the drainage that flowed in from the drain port of a bathtub; and a check valve 10 provided at a confluence part 6 where the drainage from the washing place and the drainage from the bathtub meet for preventing drainage from flowing back through the bathtub drain pipe 3. The valve body 11 of the check valve 10 is formed in a concave shape having a recess in the backflow direction of the bathtub drain pipe 3.SELECTED DRAWING: Figure 1 【課題】 防臭パイプの下端が排水トラップの底面付近まで延びている場合でも、逆流防止弁の開放時の排水流量を確保し、優れた排水能力を発揮しうる排水トラップにおける逆流防止弁を提供する。【解決手段】 排水口２に流入した洗い場からの排水を排水トラップ１内へ案内する部材である防臭パイプ４と、浴槽の排水口から流入した排水を排水トラップ１内へ導く浴槽排水管３と、洗い場からの排水と浴槽からの排水とが合流する合流部６に、排水が浴槽排水管３を逆流することを防止する逆流防止弁１０とを備える排水トラップ１における逆流防止弁１０であって、逆流防止弁１０の弁本体１１は、浴槽排水管３の逆流方向に向かって窪みを有する凹状に形成されていることを特徴とする。【選択図】図１