{"id":3276,"date":"2022-06-04T01:58:34","date_gmt":"2022-06-04T01:58:34","guid":{"rendered":"http:\/\/sinovalveco.com\/?p=3276"},"modified":"2026-03-27T07:59:10","modified_gmt":"2026-03-27T07:59:10","slug":"non-return-flap-valve","status":"publish","type":"post","link":"https:\/\/ntgdvalve.com\/pt\/non-return-flap-valve\/","title":{"rendered":"V\u00e1lvula de retalho sem retorno NTGD: Princ\u00edpio de funcionamento, tipos, vs. v\u00e1lvula de reten\u00e7\u00e3o oscilante (guia completo)"},"content":{"rendered":"

A non return flap valve is an automatic check valve designed to allow flow in one direction and prevent reverse flow in pipelines, pump discharge lines, and process systems. It is widely used in water, wastewater, chemical, and industrial service where backflow can damage pumps, contaminate upstream media, or destabilize system pressure.<\/p>\n

Compared with a traditional swing check valve, a non return flap valve is often selected when the application requires a more compact structure, faster closing response, wafer-style installation, or lower reverse-flow travel in pump-related service. In real projects, correct selection depends not only on valve type, but also on pressure rating, installation direction, medium, temperature, solids content, closure behavior, and actual pump shutdown conditions.<\/p>\n

NTGD non return flap valves are manufactured in accordance with API 594 check valve standard requirements<\/a> and EN 12334 design requirements, with optional spring-assisted closure and material customization for pump discharge, wastewater, and process applications. For engineers, EPC contractors, and procurement teams, this guide explains how the valve works, how to compare it with a swing check valve, how to select the right design, and what information is needed for accurate quotation.<\/p>\n

Quick Selection Summary<\/strong><\/p>\n