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What is Filter Nozzle

2017-05-23 By Lisa

Features of the Filter Nozzle

 

The wedge wire filter nozzles for water treatment in a nozzles a slot tube. UBO Filter Equiment Co.,Ltd can offter you many kinds of filter nozzles. Anout the feature, the nozzles are closed on one side and have a threaded fitting on the other. And the nozzles may be installed in lateral pipes or in suspended floors. A nozzle has three main components, a strainer to exclude the media or packing gravel, a water control orifice and a tail pipe with an orifice(s) to control the airflow. Nozzles may rely upon the open area of the strainer slots to provide the controlling head loss for good distribution or an independent orifice within the assembly is often preferred. Strainer slots can become partially blocked with media. This will alter the head loss across the slots. If the control orifice is within the body of the nozzle and the slots have a larger open area, there will be less affect by partial blocked slots to the head loss through the nozzle.


wedge wire stainless steel filter nozzles

Diameter and Functions of the Filter Nozzle

 

Filter Nozzle slot sizes vary considerably from about 0.2mm to around 10mm, larger slots best suited for up flow filters. Slots of 0.2, 0.3 & 0.35mm are commonly used in direct contact with the filter media without the requirement of a gravel layer on top of the nozzles. This direct contact has an advantage for combined air scour and water backwash. Care must be taken to avoid grit particles entering with the backwash water if slots less than 1.0 mm width are to be used. If filtrate is always used for backwashing there is usually no problem.

The function of the tailpipe of the filter nozzle is to control the distribution of air. If air is not used, the tailpipes are not required. Tailpipes are usually provided with an upper orifice (starter or air bleed hole) and lower orifices or slot (metering hole/slots). As air is applied to the floor whether suspended or of the lateral type, the air collects under the floor and depresses the water downward until the air reaches the metering hole or slot. The metering hole is sized accordingly to prevent the air reaching the end of the tail pipe, which would cause poor distribution of the air scour and localized aggressive aeration in turn causing uneven media, possible carryover of media in to the drain channels and the mixing of filter media layers if used.

Material of the Filter Nozzle and Service of UBO

 

Filter nozzles can be made of many materials such as plastics and metals and are supplied with auxiliary parts to enable fitting in concrete, metal plate floors and pipe lateral systems. And UBO Filter Equiment Co.,Ltd can provide the wedge wire screen stainless steell filter nozzle. What's more, we have a professionial design team, so we can design the filter nozzle as the customer's request.

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