H42W立式止回閥 H14W螺紋止回閥 HH44X緩閉止回閥 HH47X液壓緩沖止回閥 H61Y鍛鋼止回閥 HC44X橡膠瓣止回閥 HC42X消聲止回閥 HH49X緩閉式止回閥 HH44X微阻緩閉止回閥 HD741X液控止回閥 BH44H/W 夾套保溫止回閥 HC42T靜音止回閥