4 inch single chamber three way backwash valve

4 inch backwash valve

Filter Backwash Hydraulic Valve 


(2X2 Plastic)

The CDFS Model IR-2x2-350-P is a compact 3-port valve, 

in a T configuration. It is double chambered, hydraulically operated, and diaphragm actuated. 

Designed for automatic backwashing of filtration systems, 

The CDFS Model IR-2x2-350-P is available in Angle flow (A) and Straight flow (S) configurations. 

 Features and Benefits

For full technical details, refer to Engineering Section.


■ Line Pressure Driven


■ Double Chambered Design


❏ Wide application range


❏ Requires low actuation pressure


❏ Protected diaphragm


■ Dynamic Sealing


❏ Seals at very low pressure


❏ Prevents seal friction and erosion


■ Engineered Plastic Valve Design


❏ Highly durable, chemical and cavitation resistant


■ Short Valve Travel


❏ Smooth changes of flow direction


❏ Eliminates mixing of supply and waste water


■ User- Friendly


❏ Can be installed in various orientations


❏ Simple in-line inspection and service


Typical Applications


■ Automatic Backwash of Filter Batteries


❑ Gravel Filters


❑ Disc Filters


❑ Screen Filters


■ Single Filter Autonomic Backwash System


■ Angled or Straight Installations

[1] CDFS Model IR-2x2-350-A-P allows flow into the filter, 

switches closed upon pressure rise command blocking inlet to filter and enables backwash flow from the filter.


[2] CDFS Backwash Flow Control Valve Model IR-470-beKU


[3] CDFS Water meter Model WPH


[4] CDFS Air Valve Model ARA-A-P-P

Technical Data


Control Chamber Displacment Volume: 0.13 liter; 0.04 gallon


Operating Pressure: 0.7-10 bar; 10-145 psi


External Operating Pressure: 85%-100% of operating pressure


Maximum Temperature: 65°C;150°F


End Connections: Threaded, Grooved (with adaptors) Flow Patterns:


Angled Flow, Reverse Angled Flow, Straight Flow, Reverse Straight Flow




Valve Body, Separating Partition & Lower Adaptor:


Polyamide 6 – 30GF Black


Cover: Polyamide 6 – 30GF


Angle Flow: Black


Straight Flow: Gray


Diaphragm: NR-AL52 Nylon Fabric Reinforced


Seats, Diaphragm Washers: Brass


Plug, Plug Washer: Acetal Copolymer Black


Stopper Disk: PVC-U


Seal, O-Rings: NBR


Spring: Stainless Steel AISI 302


Shaft: Stainless Steel AISI 303


External Bolts, Studs, Nuts & Disks: Stainless Steel



Changer Code