Key Features

Pilot-assisted pressure sustaining valve
Automatic back pressure control
Maintains minimum upstream pressure
Responds automatically to flow demand
Helps protect booster pumps
Helps maintain upstream system pressure
DN50 to DN200 flange sizes
Heavy-duty ductile iron body
Corrosion-resistant epoxy coating
Bronze piston, cylinder and seat
Patented cylindrical piston design
Exceptionally high flow capacity
Straight-through low-loss flow path
Externally mounted pilot controller
Pilot serviceable without valve removal
Stainless steel pressure gauge included
Maximum inlet pressure 20 Bar
Pressure tested to 32 Bar
Adjustable pressure from 0.5 to 8 Bar
Alternative pressure ranges available
PN16 flange connection as standard
ANSI, JIS and alternative flange options
NBR or FKM (Viton) seals
Suitable for fluids up to +80°C
Suitable for light oils up to 50 cSt
Mountable in any position
Custom sizes available up to 56"
Custom Munsell colours available

Datasheets

Description

Flanged Pilot-Assisted Pressure Sustaining (Back Pressure) Valve – Z-Tide Industrial BFS Series

The Z-Tide Industrial BFS Series is a heavy-duty flanged pilot-assisted pressure sustaining (back pressure) valve designed to automatically maintain a minimum upstream pressure in high-flow water and compatible fluid systems.

Featuring an externally piloted pressure-assisted piston design, the BFS continuously monitors upstream pressure and automatically modulates the main valve to maintain the selected minimum back pressure despite changes in downstream flow demand. This helps protect booster pumps and upstream equipment while maintaining stable system pressure.

Manufactured from epoxy-coated ductile iron with bronze piston, cylinder and seating components, the BFS combines exceptionally high flow capacity with robust industrial construction. Available from DN50 to DN200 with PN16 flanges as standard, with ANSI 150 lb, JIS10K, JIS20K, PN10, PN20 and alternative flange standards also available.

Ideal for booster pump protection, water distribution networks, pressure zoning, industrial process water, cooling systems and municipal water infrastructure.

Valve function & operation

Function: Pilot-assisted pressure sustaining (back pressure) valve

Externally piloted pressure control

Operating principle: Pressure-assisted piston with external pressure sustaining pilot

Maintains a constant minimum upstream pressure

Stainless steel pressure gauge displays sustained pressure

Flange sizes:

DN50 to DN200 PN16

Optional flange standards:

ANSI 150 lb

JIS10K

JIS20K

PN10

PN20

Other flange standards available on request

Pressure & regulation

Maximum inlet pressure: 20 Bar

Pressure tested to: 32 Bar

Pressure sustaining ranges:

0.5 to 4 Bar

2 to 8 Bar

Additional pressure ranges available on request

Maximum media temperature: +80°C

Minimum media temperature: -15°C

Maximum media viscosity: 50 cSt

Mounting position: Any position

Construction & materials

Body: Epoxy-coated ductile iron

Cylinder: Bronze

Piston: Bronze

Seat: Bronze

Internals: Bronze, brass and stainless steel

Spring: 304 stainless steel

Standard seals: NBR

Optional seals:

FKM (Viton)

Coating colour: Standard factory blue finish, with optional customer-specified paint colours and Munsell colour matching available. Munsell 10Y 6/1 is one available custom finish.

Media compatibility

✓ Water

✓ Potable water

✓ Cooling water

✓ Process water

✓ Light oils up to 50 cSt

✓ Fluids compatible with the valve materials

Pressure Control & Performance

✓ External pilot continuously monitors upstream pressure

✓ Automatically maintains the selected minimum upstream pressure

✓ Modulates flow in response to changing downstream demand

✓ Helps prevent excessive upstream pressure loss

✓ Helps protect booster pumps and upstream equipment

✓ Stainless steel pressure gauge displays sustained upstream pressure

✓ Patented cylindrical piston provides exceptionally high flow capacity

✓ Straight-through flow path minimises pressure loss, turbulence and hydraulic noise

✓ External pilot assembly can be serviced without removing the main valve from the pipeline

✓ U-ring sealing system provides reliable long-term operation

Applications

Booster pump protection

Water distribution networks

Pressure zoning systems

Industrial process water systems

Cooling water systems

Municipal water infrastructure

Chemical processing

Food and beverage manufacturing

General industrial process control

Manufacturing quality

Manufactured using a heavy-duty epoxy-coated ductile iron body with bronze piston and precision-machined bronze and stainless steel internal components, the Z-Tide Industrial BFS Series has been engineered for reliable long-term operation in demanding industrial environments. Its pilot-assisted pressure sustaining controller continuously monitors upstream pressure and automatically adjusts the main valve to maintain the selected minimum back pressure, protecting upstream equipment and maintaining stable system operation regardless of downstream demand. The patented cylindrical piston design provides exceptionally high flow capacity while the externally mounted stainless steel pressure gauge allows simple commissioning, adjustment and routine monitoring. The removable pilot controller further simplifies maintenance by allowing servicing without removing the main valve body from the pipeline.

Ordering information

Simply select the required flange size, pressure sustaining range, seal material and flange standard before adding the valve to your basket. Alternative pressure ranges, flange standards, seal materials and custom sizes up to 56" are available on request.

Related Products & Categories

Pressure Reducing Valves

Pressure Sustaining Valves

Safety Pressure Relief Valves

Z-Tide Manufacturing Product Range

View Technical Specification

Technical Specification

Brand: Z-Tide Co Ltd

Model: BFS-D

Width: 95.00 mm

Height: 95.00 mm

Depth: 190.00 mm

Weight: 12.00 kg

Valve / Product Type: Pressure Sustaining Valve

Body Material: Ductile Iron

Port Size: 4 inch Flange DN100 , 5 inch Flange DN125 , 6 inch Flange DN150 , 8 inch Flange DN200 , 10 inch Flange DN250, 12 inch Flange DN300 , 14 inch Flange DN350 , 16 inch Flange DN400 , 18 inch Flange DN450 , 2 inch Flange DN50, 20 inch Flange DN500 , 21/2 inch Flange DN65 , 3 inch Flange DN80

Operation: Pressure Assisted from 0.5 Bar

Pressure: 0.2 Bar (200 mBar), 0.3 Bar (300 mBar), 0.4 Bar (400 mBar), 0.5 Bar (500 mBar), 0.6 Bar (600 mbar), 0.7 Bar (700 mBar), 0.8 Bar (800 mBar), 1 Bar, 1.2 Bar, 1.3 Bar, 1.4 Bar, 1.5 Bar, 1.6 Bar, 2 Bar, 2.5 Bar, 3 Bar, 3.5 Bar, 4 Bar, 4.5 Bar, 5 Bar, 5.5 Bar, 6 Bar, 6.5 Bar, 7 Bar, 7.5 Bar, 8 Bar

Seals: NBR, FKM (Viton)

Media: Fluid (Non Aggressive), Water

Options required: Anti Water Hammer

Orifice: 125mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 50mm, 65mm, 80mm

Found in these Categories

DN50-200 Pressure Sustaining Valve Ductile Iron 0.2-8 Bar

£660.74 incl. VAT £550.62 ex. VAT

-40% Was ~~£1,101.24~~ incl. VAT

Select Valve Size (Model)

Add To Cart

Brand: Z-Tide Co Ltd

Model: BFS-D

Stock: 20 in stock

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Read Full Description

Key Features

Datasheets

Description

Flanged Pilot-Assisted Pressure Sustaining (Back Pressure) Valve – Z-Tide Industrial BFS Series

Valve function & operation

Flange sizes:

Pressure & regulation

Construction & materials

Media compatibility

Pressure Control & Performance

Applications

Manufacturing quality

Ordering information

Related Products & Categories

Technical Specification

Found in these Categories

DN50-200 Pressure Sustaining Valve Ductile Iron 0.2-8 Bar

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