# 単球形と二球形ゴム伸縮継手の選定\n\n## B2Bバイヤー向けガイド\n\n本記事は、海外の技術購買、施工会社、販売代理店、OEM/ODM顧客が、見積依頼前に必要な技術情報を整理できるように作成されています。\n\n## 配管部品: 単球形と二球形ゴム伸縮継手の選定\n\n製品名だけで判断せず、配管サイズ、圧力、接続規格、材質、流体、温度、設置位置、数量、図面を確認してください。\n\n関連製品にはゴム伸縮継手、伝力継手、管継手、フランジアダプター、金属ベローズ伸縮継手、防水スリーブなどがあります。\n\n## RFQ\n\n見積を早く正確にするには、DNサイズ、圧力等級、フランジ規格、材質、使用流体、温度、数量、図面または写真を送ってください。\n\n- DN / size\n- pressure rating\n- connection standard\n- material\n- working medium and temperature\n- quantity\n- drawing, photo or specification\n\n## Quality and Packing\n\n出荷前には外観、寸法、接続面、付属部品、表示、梱包方法を確認します。試験要求は生産前に確認してください。\n\n## Project Inquiry\n\nプロジェクト用の配管部品が必要な場合は、サイズ、圧力、接続規格、材質、流体、数量、図面をお送りください。
常见问题
?Does a double sphere rubber expansion joint always allow more movement?
It may provide greater or different movement capability, but actual movement depends on the selected size, pressure, construction and manufacturer data.
?Which design is better for pump connections?
A single sphere design is often evaluated first because it is compact. A double sphere may be considered when additional verified movement is required and sufficient installation space is available.
?Is a double sphere joint rated for higher pressure?
Not automatically. Pressure capability depends on the complete rubber body, reinforcement, size, temperature and product design.
?Is a double sphere joint better for pump suction?
Not by default. Pump suction selection must be based on minimum internal pressure and verified vacuum capability.
?Do single and double sphere joints require control rods?
Control rods are selected according to pressure thrust, anchors, equipment loads and pullout risk rather than sphere count alone.
?What information is needed to compare single and double sphere joints?
Provide size, installed length, medium, temperature, pressure, vacuum, movement, flange standard, supports, restraints, quantity and piping drawings.