Product

Pump room valve group update and renovation

Brand：Pneumatic eccentric butterfly valve 型号：T1047

This project is the renovation of the valve group in the water supply pump room of the water plant, aiming to improve the operational efficiency and safety of the water supply pump room and ensure stable water supply. Three electric butterfly valves, three check valves, and three expansion joints need to be replaced to meet the operational needs of the water plant.
1. Equipment supply: Provide 3 brand new electric butterfly valves, 3 check valves, and 3 expansion joints that meet national standards. Electric butterfly valves have remote control and precise adjustment functions, check valves effectively prevent water backflow, and expansion joints compensate for pipeline thermal expansion and contraction.
2. Installation and commissioning: Responsible for valve group installation and commissioning, ensuring normal operation, providing installation plans and schedules.
3. After sales service: Provide a certain period of warranty service, respond to repair needs in a timely manner, provide operation training and technical support.
4. The warranty period shall be at least 12 months (based on the date of the acceptance certificate). During this period, if there are any quality issues with the subject matter itself, the winning bidder shall be responsible for replacing it. The replacement costs incurred shall be borne by the winning bidder.
5. The quality requirements shall comply with the quality standards and acceptance specifications issued by the state, as well as the technical requirements of the bidding documents for this project.
8、 Technical requirements
8.1 Technical documents for silent check valve
8.1.1 Product Usage
Silent check valve (hereinafter referred to as check valve) is commonly known as a nozzle check valve in foreign countries, and is also known as an axial flow check valve or a flow guide quick closing check valve in China. The check valve is mainly composed of a valve body (adopting a split structure), valve disc, valve seat, flow guide body, spring group, etc. Suitable for water supply and drainage, fire protection, HVAC, chemical, power plant, metallurgy, petrochemical and other systems, it can be installed at the outlet of the water pump to prevent backflow and water hammer damage to the water pump.
8.1.2 Technical Requirements
1. Type: Axial flow check valve (guide type quick closing check valve)
2. Check valve nominal diameter: DN300~DN900, nominal diameter should comply with the provisions of GB/T1047;
3. Check valve nominal pressure: PN10, PN16, PN25, nominal pressure should comply with the provisions of GB/T1048;
4. Connection type of check valve: flange connection, in accordance with the provisions of GB/T17241.6 and GB/T17241.7 or GB/T9113.1 connection standards;
5. The structural length complies with GB/T21387 axial flow check valve (excluding DN450);
6. Manufacturing standards for check valves: GB/T21387 axial flow check valves or CJ/T255

8.1.3、性能特点

1.止回阀内部水流通道采用流线型设计,水流可从阀瓣内外侧同时流过，后端的导流体可使水流几乎无紊流现象；

2.止回阀需采用无轴设计，由弹簧和簧片组件在阀瓣周向均匀支撑，使阀瓣在启闭行程中无摩擦,杜绝由此引起的内件磨损，从而大大降低维修机率；

3.止回阀阀瓣采用环状结构设计，极大的减轻了阀瓣的重量，且阀瓣面垂直于流动方向设计具关闭行程短，同时在弹簧组的作用下，阀瓣可达快速关闭而不造成压力的波动，一般静态关闭时间为0.15s~0.5s，从而保证在运行中速闭减小倒流速度，防止运行中巨大水锤及水击声，形成静音效果；

4. 根据CJ/T255中的规定，止回阀最小开启压力应在1.5KPa~2.5 KPa，全开流速≤1.2m/s（一般流速在2.5m/s时水损不超过30cm），全开流阻系数ξ应不大于0.8；

5.弹簧：应根据最小开启压力来设计，弹簧应按GB/T1239.6圆柱螺旋弹簧I级弹簧的设计要求（循环载荷≥10⁶次），保证弹簧寿命；

6.止回阀阀体上应有标明水流方向的箭头指示。

8.1.4、基本参数

技术特性	特性参数
公称通径（mm）	KRVR DN300~DN900
公称压力（MPa）	PN1.0 、PN1.6、PN2.5
工作温度（℃）	0~70℃
适用工作介质	清水，原水
壳体试验压力（MPa）	1.5倍公称压力
密封试验压力（MPa）	1.1倍公称压力
试验标准	API598
阀门制造标准	GB/T21387或CJ/T255

PN40如有需求请与技术中心联系

8.1.5、零件材料表

序号	名称	材质
1	上、下阀体	球墨铸铁（QT450-10）
2	阀座	铝青铜（ZCuAl10Fe3）
3	阀瓣	铝青铜（ZCuAl10Fe3）
4	扩散体	球墨铸铁（QT450-10）
5	扩散体座	球墨铸铁（QT450-10）
6	螺杆	高碳钢（35CrMoA）
7	弹簧	不锈钢（0Cr19Ni9）
8	压块	不锈钢（0Cr19Ni9）
9	簧片	不锈钢（0Cr19Ni9）