自力式壓差控制閥ZY47type self-reliance type differential pressure control valves ZY47公稱通徑 Nominal diameter: DN25~DN300公稱壓力 Nominal pressure: PN1.0?2.5MPa適用介質 Applicable medium:水、污水 Water,dirty water適用溫度 Applicable temperature: -10℃- 150℃