Key Features

Pilot-assisted automatic pressure relief
Protects pipelines from over-pressure
DN50 to DN500 flange sizes
304 or 316 stainless steel construction
Patented cylindrical piston design
High flow pressure relief capacity
Rapid opening at preset pressure
Progressive closing reduces pressure surge
Helps minimise water hammer
Externally mounted pilot controller
Pilot can be serviced without valve removal
Straight-through high-flow design
Low pressure loss and turbulence
Stainless steel pressure gauge included
Maximum inlet pressure 25 Bar
Pressure tested to 38 Bar
Adjustable relief pressures 0.5–13 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
Mountable in any position
Large custom sizes up to DN1400 available
Ideal for pump and pipeline protection

Datasheets

Description

Flanged Stainless Steel Pilot-Assisted Pressure Relief Valve – Z-Tide Industrial BFL-S Series

The Z-Tide Industrial BFL-S Series is a heavy-duty flanged pilot-assisted pressure relief valve designed to automatically protect water and compatible fluid systems against excessive pressure. Manufactured in either 304 or 316 stainless steel, the BFL-S Series combines excellent corrosion resistance with precise pressure relief control.

Valve function & operation

Function: Pilot-assisted pressure relief valve

Externally piloted pressure control

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

Automatically relieves excess system pressure

Stainless steel pressure gauge displays inlet pressure

Flange sizes: DN50 to DN500 PN16

Optional flange standards:

ANSI 150 lb

JIS10K

JIS20K

PN10

PN20

Other flange standards available on request

Pressure & regulation

Maximum inlet pressure: 25 Bar

Pressure tested to: 38 Bar

Pressure relief adjustment ranges:

0.5 to 4 Bar

2 to 8 Bar

5 to 13 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: 304 or 316 stainless steel

Pressure tested to 38 Bar

Cylinder: 304 or 316 stainless steel

Piston: 304 or 316 stainless steel

Seat: 304 or 316 stainless steel

Internals: Stainless steel

Spring: 304 stainless steel

Controller: 304 or 316 stainless steel

Standard seals: NBR

Optional seals:

FKM (Viton)

Media compatibility

✓ Water

✓ Process water

✓ Cooling water

✓ Light oils up to 50 cSt

✓ Fluids compatible with the valve materials

Performance & design

✓ Patented cylindrical piston design

✓ Exceptionally high flow capacity compared with conventional pressure relief valves

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

✓ Externally mounted pilot controller allows servicing without removing the main valve body from the pipeline

✓ Unique U-ring sealing system provides long, reliable, maintenance-free service

✓ Opens rapidly when system pressure reaches the preset maximum pressure

✓ Closes progressively as pressure returns to the set pressure, helping minimise hydraulic shock and pressure surges

✓ Stainless steel pressure gauge provides continuous indication of inlet pressure

Applications

Pump discharge protection

Industrial water distribution

Process water systems

Cooling water circuits

Chemical processing

Food and beverage manufacturing

Pharmaceutical production

Water treatment plants

Corrosive fluid handling

General industrial process control

Manufacturing quality

Manufactured using heavy-duty 304 or 316 stainless steel with precision-machined stainless steel internal components, the Z-Tide Industrial BFL-S Series has been engineered for demanding industrial environments where corrosion resistance, reliability and precise pressure protection are essential. Its pilot-assisted pressure relief controller continuously monitors inlet pressure and automatically opens the main valve whenever the preset maximum pressure is exceeded, protecting pumps, pipelines and critical process equipment from over-pressure conditions. 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 simplifies maintenance by allowing servicing without removing the main valve body from the pipeline, reducing downtime and maintenance costs.

Ordering information

Simply select the required body material (304 or 316 stainless steel), flange size, pressure relief adjustment 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 DN1400 (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: BFL-S

Width: 95.00 mm

Height: 95.00 mm

Depth: 190.00 mm

Weight: 10.00 kg

Valve / Product Type: Pressure Relief / Limiting Valve

Body Material: Stainless Steel

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, 8.5 Bar, 9 Bar, 10 Bar, 12 Bar, 13 Bar

Seals: NBR, FKM (Viton)

Media: Fluid (Non Aggressive), Fluid (Slight Acid/Alkali), Water, Water (RO/Pure/Demin)

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

Found in these Categories

Pressure Relief & Limiting Valves

DN50-200 Stainless steel pressure relief valve 0.5-13 Bar

£1,247.40 incl. VAT £1,039.50 ex. VAT

-40% Was ~~£2,079.00~~ incl. VAT

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