Backwash Valve Assembly

Product Specifications

Technical details and manufacturing context for Backwash Valve Assembly

Definition

The Backwash Valve Assembly is a component used in backwash filtration systems to manage the reversal of flow through filter media for cleaning purposes. It typically comprises multiple valves, actuators, and control mechanisms that work together to initiate, control, and terminate the backwash process. During normal filtration, the assembly maintains forward flow through the filter. When backwash is initiated, the valve assembly redirects flow in the reverse direction, often using multi-port valves, solenoid valves, or pneumatic actuators to create the necessary pressure differential that dislodges trapped particles from the filter media. This assembly is available in various configurations to suit different system sizes and operating conditions. Key parameters include nominal diameter (DN25–DN200 per ISO 6708), operating pressure (1.0–1.6 MPa), test pressure (2.4 MPa hydrostatic shell test per ISO 5208), operating temperature (0–80°C), flow coefficient (Cv 10–120 m³/h at fully open position), leakage rate (≤0.01% of rated flow, Class VI), actuation torque (5–50 N·m), cycle life (10,000–50,000 cycles), body material (WCB/CF8/CF8M per ASTM A216/A351), seal material (EPDM/NBR/PTFE per ASTM D2000), weight (5–80 kg), and ingress protection (IP65–IP67 per IEC 60529). Materials on file include stainless steel, brass, PVC, and EPDM seals. These values are reference ranges and must be verified for the specific model and application with the legal manufacturer or supplier. The assembly is intended for use in water treatment, industrial processes, and other filtration applications where periodic backwashing is required. Proper selection depends on system flow rate, pressure, temperature, and media compatibility. Installation and maintenance should follow manufacturer guidelines to ensure reliable operation and longevity.

Working Principle

During normal filtration, the backwash valve assembly maintains forward flow through the filter media. When backwash is initiated, the assembly redirects flow in the reverse direction, using a combination of multi-port valves, solenoid valves, or pneumatic actuators to create a pressure differential that dislodges trapped particles from the filter media. The control mechanism sequences the valves to ensure proper flow direction and timing, allowing the cleaning solution or water to flush out contaminants. After the backwash cycle, the assembly returns to the filtration mode, restoring normal operation.

Common Materials

Stainless Steel, Brass, PVC, EPDM Seals

Technical Parameters

Parameter	Typical range	Notes & selection driver
Nominal Diameter	DN25–DN200 mm	Select based on system flow rateISO 6708
Test Pressure	2.4 MPa	Hydrostatic shell test
Operating Temperature	0–80 °C	Above 80°C seal life is reduced
Flow Coefficient (Cv)	10–120 m³/h	At fully open position
Leakage Rate	≤0.01 % of rated flow	Class VI seat leakageISO 5208
Actuation Torque	5–50 N·m	Required for manual or automated operation
Cycle Life	10000–50000 cycles	Depends on sealing material
Body Material	WCB/CF8/CF8M	WCB for water, CF8M for corrosive mediaASTM A216/A351
Seal Material	EPDM/NBR/PTFE	EPDM for hot water, NBR for oilASTM D2000
Weight	5–80 kg	Depends on size and material
Ingress Protection	IP65–IP67	For electric actuator enclosureIEC 60529

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Valve Body
Main housing that contains flow passages and provides connection points

Material: Stainless Steel
Actuator
Mechanism that opens and closes the valve, can be manual, pneumatic, or electric

Material: Aluminum Alloy
Seals/Gaskets Part
Prevent leakage between moving parts and connection points

Material: EPDM or Viton
Control Mechanism
Regulates valve position and timing during backwash cycle

Material: Various (depending on actuation type)
Multi-Port Valve
The ported element that switches the flow path between filtration and backwash direction.

Material: Stainless Steel
Solenoid Valve Optional
Switches the pilot or bypass line electrically on solenoid-operated versions.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Backwash System

View system integration details

Manufacturers of Backwash Valve Assembly

Manufacturer profiles associated with Backwash Valve Assembly.

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Frequently Asked Questions

What is the purpose of a backwash valve assembly?

It controls the flow direction in a filtration system, allowing reverse flow during backwash to clean the filter media by dislodging trapped contaminants.

What materials are commonly used in this assembly?

Materials on file include stainless steel, brass, PVC, and EPDM seals. Body material options include WCB, CF8, and CF8M, and seal materials include EPDM, NBR, and PTFE.

What are the typical operating pressure and temperature ranges?

The operating pressure range is 1.0–1.6 MPa, and the operating temperature range is 0–80°C. These are reference values; verify for your specific model.

How do I select the correct backwash valve assembly?

Selection should be based on system flow rate, nominal diameter, operating pressure, temperature, media compatibility, and actuation requirements. Always confirm with the manufacturer or supplier.

Data Basis

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Preliminary Technical Classification

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pressure:	0-10 bar (150 psi)
flow rate:	Up to 200 m³/h
temperature:	0°C to +80°C
slurry concentration:	Up to 5% solids by weight

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