Differential pressure controllers & flow controllers / limiters

在线商城

A combined differential pressure controller and flow controller (PQ) consists of two independent differential pressure controllers and a flow restrictor (manual balancing valve) integrated in one valve body.

This device has two functions:

1) A differential pressure controller maintains fixed differential pressure over the flow restrictor (flow control). This ensures automatic flow limitation, independent of pressure variations in the system.

2) A differential pressure controller maintains constant differential pressure over motorized control valves or over the entire loop.

This is the best solution for the district heating utility as it enables both variables (maximum flow and differential pressure) to be set independently of the consumer’s heating control system. Especially when the subscriber station is owned by the consumer, the utility has no influence over flow limitation at the consumer’s end of the system.

This enables the district heating utility to control the flow available for each consumer as well as the differential pressure control at the substation. This allows efficient network balancing.

Another solution is the PB controller, which consists of one pressure controller and a flow restrictor (manual balancing valve). The PB is used in systems where independent flow and differential pressure are not required.

Differential pressure and flow controllers in district heating or cooling systems (variable flow)

Balance your network, save energy and improve end user comfort by hydronic balancing and control of district energy networks.

特点和优势

Eliminates pressure variations and provide optimum operating conditions with improved temperature control quality
Made for demanding systems, resistant to corrosion, cavitation and dirt
Connected system is protected against pressure surges, fluctuations, cavitation and noise

案例故事

成本高效的解决方案：哥本哈根市中心的区域供冷

在哥本哈根地区的供冷项目设计中，能源效率是主要考虑因素之一。该项目使用 VLT® 变频器帮助每年减少 3000 多吨的 CO2 排放量。

太阳能供热厂每年减少 CO2 排放 15,700 吨

世界上颇具规模的太阳能供热厂位于丹麦锡尔克堡，利用能源为 4 万公民的家庭和工作场所供暖。该工厂为丹麦锡尔克堡市提供 18-20% 的年热量消耗，制定了远大目标，即到 2030 年在热产生中实现 CO2 中和。

常见问题

是否可以通过压差调节器限制最大流量？

是的，您可以。完全打开控制阀，调节压差，设定最大流量。此外还可以计算恰当压差，但您需要知道控制阀的准确容量。

我们根据工程规范设计阀门安装和需求长度。

我们按照标准长度生产阀门。您还可以在数据表中寻找测量数值，或从产品介绍中下载二维和三维 CAD 模型图。请前往我们的产品目录表，您将在其中找到文件和图纸链接 — 请点击以下链接。

我们已经安装了 DN125 差压控制器，但最后发现需要更大的设定范围。我们是否需要订购新的压力驱动器？

否。您无需更换压力驱动器。只需更换设定弹簧即可。请联系当地销售或技术支持人员，了解更多使用说明。

我准备安装 AFPQ 控制器。但我不知道如何连接脉冲管？

请利用产品随附使用说明书进行查阅，或点击以下链接，打开在线版使用说明： http://heating.danfoss.com/pcmpdf/vicag25v%20%20afpq,vfq.pdf

工具和应用

供热选型器

丹佛斯供热选型器是同类优秀的在线选型工具，它可以为供热应用专家优化规划流程。

打开供热选型器