Clack V3764-BSPT WS3 3" Drain Line Flow Control (DLFC) – Male x Female BSPT

The Clack V3764-BSPT WS3 3" Drain Line Flow Control (DLFC) Assembly is a genuine Clack stainless steel flow control housing designed for large commercial and industrial water softeners and backwashing filtration systems.

Featuring 3" male BSPT inlet and 3" female BSPT outlet connections, this heavy-duty assembly provides controlled drain flow during regeneration and backwashing, helping to ensure the correct backwash rate for the vessel size and filtration media.

The V3764-BSPT accommodates up to nine 1" drain line flow control washers, providing a combined flow control range of 9.0 to 225 GPM (34–852 L/min).

Its configurable multi-washer design makes it particularly suitable for large water treatment installations requiring high backwash flow rates.

Key Features

• Genuine Clack V3764-BSPT drain line flow control assembly

• Designed for Clack WS3 control valves

• 3" male BSPT inlet and 3" female BSPT outlet

• Flow control range from 9.0 to 225 GPM

• Heavy-duty stainless steel housing

• Accommodates up to nine 1" DLFC washers

• Configurable using one or two interlocking washer retainers

• Reliable flow washer design for consistent backwash control

• Removable internal components for servicing and maintenance

• Suitable for large commercial and industrial water treatment systems

Technical Specifications

Drain Line Flow Control Washers

The Clack V3764-BSPT uses a combination of 1" flow control washers to achieve the required drain flow rate.

Single Retainer Configuration

Using one washer retainer, the assembly can accommodate up to five 1" DLFC washers, providing a combined flow rate of up to 125 GPM.

Double Retainer Configuration

For higher flow requirements, two interlocking retainers can be installed to accommodate up to nine 1" DLFC washers, providing a maximum combined flow rate of 225 GPM.

Compatible Clack V3190 series washers are available in the following sizes:

The required total flow rate is achieved by combining the ratings of the installed washers.

Applications

The Clack V3764-BSPT is suitable for high-capacity water treatment installations, including:

• Large commercial and industrial water softeners

• Activated carbon filtration systems

• Iron and manganese removal filters

• Multimedia and sediment filtration systems

• High-flow backwashing vessels

• Industrial water treatment and process water filtration systems

Installation Information

The V3764-BSPT connects to the 3" BSPT drain outlet of a compatible Clack WS3 control valve or other suitable water treatment equipment.

The assembly uses interlocking washer retainer discs and a retaining ring to secure the flow control washers in position.

When configuring the assembly, the appropriate openings in the retainers must be prepared to accept the selected washers. All components must be correctly orientated in the direction of water flow.

The required backwash flow rate should be calculated according to the vessel diameter, filtration media, bed depth and operating temperature.

Ensure the available water supply and drain pipework can accommodate the selected flow rate.

Please Note: This assembly is supplied without DLFC buttons (flow control washers). These must be selected and purchased separately according to the required backwash flow rate.

The 9–225 GPM rating represents the available flow control range, not a fixed operating flow rate.

This assembly should not be used as the primary flow control device in critical or health-related applications.