Backflush Valves

Backflush Valves are designed for automatic backflushing of filters. Netafim offers plastic and iron hydraulically operated backflush valves to fit both disc and sand media filters.

Why Quick Relief (QR) Valves

Series 350 Backflush Valves

Glass reinforced polyamide body.
Double chambered design requires low actuation pressure for a wide application range.
Dynamic sealing diaphragm seals at very low pressure and prevents seal friction and erosion.
Highly durable reinforced plastic valve is chemical and cavitation resistant.
T-configuration valve has a common outlet connected to the filter inlet and two other outlets – one to the water inlet manifold and the other one to the drain manifold.
Used with 2″ Compact LP Disc-Kleen filter, 2″ LP Disc-Kleen filters, 3″ LP Disc-Kleen filters, Apollo Disc-Kleen filters and AGF Sand Media filters.

Iron Backflush Valves

Cast iron sturdy body.
Easy installation with no special tools required.
Low head loss from direct diaphragm sealing valve.
Grooved end connections.
Used with Sand Media filters and Disc-Kleen filters for high pressure applications.

Product Advantages

3-Way hydraulically operated diaphragm valves with low pressure loss.
Double chambered design requires low actuation pressure for a wide application range.
Dynamic sealing diaphragm seals at very low pressure and prevents seal friction and erosion.
Highly durable reinforced plastic valve is chamical and cavitation resistant.
T-configuration valve has a common outlet connected to the filter inlet and two other outlets - one to the water inlet manifold and the other to the drain manifold.
Used with disc and sand media filters.

Applications

A hydraulic command from the solenoid, which pressurizes the Lower Control Chamber, forces the diaphragm actuated Plug Assembly to move towards the Supply Port Seal, eventually sealing the valve drip tight.
This allows water flow from the filter through the Drain Port Seal.
Venting the upper control chamber causes the line pressure, together with the Spring force, to move the valve back to filtration mode.

Specifications

Series 350 Backflush Valve Specifications

Operating Pressure: 10-145 psi
Maximum Temperature: 150° F
External Operating Pressure: 85%-100% of operating pressure
Control Chamber Displacement Volume: 2″ – 0.03 gallons; 3″ – 0.09 gallons; 4″ – 0.15 gallons
2″ Series 350 Connections: Inlet – 2″ Grooved (Victaulic); Outlet – 2″ Threaded; Flush – 2″ Threaded
3″ Series 350 Connections: Inlet – 3″ Grooved (Victaulic); Outlet – 3″ Grooved (Victaulic); Flush – 2″ Threaded
4″ Series 350 Connections: Inlet – 4″ Grooved (Victaulic); Outlet – 4″ Threaded; Flush – 4″ Grooved (Victaulic) or 3″ Threaded

Series 350 Backflush Valve Materials

Valve Body, Separating Partition and Lower Adapter: Polyamide 6 – 30GF Black color
Cover: Polyamide 6 – 30GF Grey color
Diaphragm: NR-AL52 Nylon fabric reinforced
Seats, Diaphragm Washers: Stainless Steel 304
Plug, Plug Washer: Acetal Copolymer Black
Stopper Disc: PVC-U
Seal, O-Rings: NBR
Spring: Stainless Steel AISI 302
Shaft: Stainless Steel AISI 303
External Bolts, Studs, Nuts and Disc: Stainless Steel

Series 350 Backflush Valve Operation

A hydraulic command from the solenoid [1], which pressurizes the Lower Control Chamber [2], forces the diaphragm [3] actuated Plug Assembly [4] to move towards the Supply Port Seal [5], eventually sealing the valve drip tight.
This allows water flow from the filter through the Drain Port Seal [6].
Venting the upper control chamber causes the line pressure, together with the Spring [7] force, to move the valve back to filtration mode.