概要
RVA 停止逆止弁
GEA check valves open autonomously by the pressure that is exerted by the working medium upon the valve disc. They start to open at a differential pressure of 0.01 to 0.05 bar and are fully open between 0.1 and 0.2 bar. As soon as the flow is interrupted or the flow direction is reversed, the valve closes automatically. Additionally, RVA stop check valves may also be closed manually with a handwheel or a ratchet attached to the lifting stem. Rotating the stem clockwise will keep the valve disc down on the valve seat and therefore keeps the valve closed, counter-clockwise rotation will enable the valve disc to be opened by the pressure of the medium. The built-in damping device makes this type of valve especially suitable in cases where the power requirement / flow rate fluctuates. GEA stop check valves are designed for installation in industrial heating and refrigeration systems. They are installed on either the pressure or suction side of compressors or in pipes in which only one direction of flow is intended. The stem sealing is provided by a threaded bush with spring-elastic PTFE ring.
技術的な特長
- 鋼またはステンレス鋼製
- 本体材料は German DIN EN12284、AD2000 シリーズ W に応じて選択可能
- 作動媒体: グリコールベースの冷たい鹹水冷媒 EN 378 p.1 (NH3、R22、R134a など) と冷凍機油、ニュートラル、ガス、および液体媒体、グリコールベースの冷食塩水のブレンド
- 実装位置：上昇流の向きに対し水平と垂直
| RVA 停止逆止弁 | |
| 設計 | 直線またはアングル型 |
| 材質 | 鋼またはステンレス鋼製 |
| 公称寸法 | DN 10-200 |
| 呼び圧力レベル | PS 25, PS 40, PS 63 |
| 温度範囲 | -60 °C ～ +150 °C |
| 接続 | 突き合わせ溶接端 DIN、ANSI フランジ端 DIN、ANSI はんだ端 ネジ留め端 |
| その他 | カバー拡張 リニアボールベアリング |
Stop Check Valve type RVA
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