BiS is an internationally recognisedcompany with over 30 years experience in the design and manufacture of a widerange of small bore stainless steel pressure and flow control valves for highpressure liquid and gas.

Operating in a variety of sectors, we are aleading supplier to the Offshore Oil and Gas industry for topside, subsea anddownhole applications where quality, reliability and safety are critical.

With an extensive range of standardproducts and a bespoke design service we aim to provide the solutions for yourapplications.

We offer a comprehensive range of safetyrelief and relief valves for use on a wide range of media, from low pressurevalves that vent to atmosphere, to high pressure (1379 bar, 20,000 psi) pipedreturn valves. Typically, low pressure valves offer a pop-open stylecharacteristic, while higher pressure valves offerproportional or metering style operation. BiS relief valves are CEmarked to denote approval as Category IV safety accessories under the 97/23/ECPressure Equipment Directive. Many options are available, including cartridgeand manifold mounted versions, and many valves are available in exoticmaterials via the factory, including monel, inconel, hastelloy and titanium.

SAFETY RELIEF VALVE(L.P.) (S25)

1/4" Stainless Steel Vent toAtmosphere Style Safety Relief Valve for Set Pressures from 0.7 to 40 bar, withLiquid or Gas. Approved as a Safety Accessory to Category IV of thePressure Equipment Drective 97/23/EC.

SAFETY RELIEF VALVE(L.P.) (S37)

3/8" Stainless Steel Vent toAtmosphere Style Safety Relief Valve for Set Pressures from 0.7 to 40 bar, withLiquid or Gas. Approved as a Safety Accessory to Category IV of thePressure Equipment Drective 97/23/EC.

SAFETY RELIEF VALVE(L.P.) (S50)

1/2" Stainless Steel Vent toAtmosphere Style Safety Relief Valve for Set Pressures from 0.7 to 40 bar, withLiquid or Gas. Approved as a Safety Accessory to Category IV of thePressure Equipment Drective 97/23/EC.

SAFETY RELIEF VALVE(L.P.) (S75)

3/4" Stainless Steel Vent toAtmosphere Style Safety Relief Valve for Set Pressures from 0.7 to 40 bar, withLiquid or Gas. Approved as a Safety Accessory to Category IV of thePressure Equipment Drective 97/23/EC.

SAFETY RELIEF VALVE(L.P.) (S100)

1" Stainless Steel Vent to AtmosphereStyle Safety Relief Valve for Set Pressures from 0.7 to 18 bar, with Liquid or Gas.Approved as a Safety Accessory to Category IV of the Pressure EquipmentDrective 97/23/EC.

SAFETY RELIEF VALVE(L.P.) (SM25UF-RG)

Low Flow Stainless Steel Vent to AtmosphereStyle Safety Relief Valve with Relieving Gear for set pressures from 0.7 to 19bar, with liquid or gas. Approved as a Safety Accessory to CategoryIV of the Pressure Equipment Drective 97/23/EC.

SAFETY RELIEF VALVE(L.P.) (TS25)

1/4" Stainless Steel Safety ReliefValve for set pressures from 0.7 to 40 bar, with liquid or gas.Approved as a Safety Accessory to Category IV of the Pressure EquipmentDrective 97/23/EC.

SAFETY RELIEF VALVE(L.P.) (TS37)

3/8" Stainless Steel Safety ReliefValve for set pressures from 0.7 to 40 bar, with liquid or gas.Approved as a Safety Accessory to Category IV of the Pressure EquipmentDrective 97/23/EC.

SAFETY RELIEF VALVE(L.P.) (TS50)

1/2" Stainless Steel Safety ReliefValve for set pressures from 0.7 to 40 bar, with liquid or gas.Approved as a Safety Accessory to Category IV of the Pressure EquipmentDrective 97/23/EC.

SAFETY RELIEF VALVE(L.P.) (TS75)

3/4" Stainless Steel Safety ReliefValve for set pressures from 0.7 to 40 bar, with liquid or gas.Approved as a Safety Accessory to Category IV of the Pressure EquipmentDrective 97/23/EC.

SAFETY RELIEF VALVE(L.P.) (TS100)

1" Stainless Steel Safety Relief Valvefor set pressures from 0.7 to 28 bar, with liquid or gas. Approved asa Safety Accessory to Category IV of the Pressure Equipment Drective 97/23/EC.

CARTRIDGE RELIEFVALVE (L.P.) (TS25C)

1/4" Stainless Steel Cartridge StyleSafety Relief Valve for incorporation into manifolds, where low set pressuresare required. Approved as a Safety Accessory to Category IV of the PressureEquipment Drective 97/23/EC.

RELIEF VALVE (H.P.)(HS25)

1/4" Stainless Steel Vent toAtmosphere Style Relief Valve for set pressures from 400 to 2,000 psi,with liquid or gas. Approved as a Safety Accessory to Category IV ofthe Pressure Equipment Drective 97/23/EC.

RELIEF VALVE (H.P.)(HTS25)

1/4" Stainless Steel Relief Valvefor set pressures from 400 to 2,000 psi, with liquid or gas. Approvedas a Safety Accessory to Category IV of the Pressure Equipment Drective97/23/EC.

RELIEF VALVE (H.P.)(RL25)

1/4" Stainless Steel Relief Valve forpressures up to 15,000 psi. Approved as a Safety Accessory to Category IV ofthe Pressure Equipment Drective 97/23/EC.

RELIEF VALVE (H.P.)(RL37)

3/8" Stainless Steel Relief Valve forpressures up to 15,000 psi. Approved as a Safety Accessory to Category IV ofthe Pressure Equipment Drective 97/23/EC.

RELIEF VALVE (H.P.)(RL25-G)

1/4" Stainless Steel Relief Valve withSoft Seats for pressures up to 6,000 psi with liquid or gas. Approvedas a Safety Accessory to Category IV of the Pressure Equipment Drective97/23/EC.

RELIEF VALVE (H.P.)(RL37-G)

3/8" Stainless Steel Relief Valve withSoft Seats for pressures up to 6,000 psi with liquid or gas. Approvedas a Safety Accessory to Category IV of the Pressure Equipment Drective97/23/EC.

CARTRIDGE RELIEFVALVE (H.P.) (RL25C)

1/4" Stainless Steel Cartridge StyleRelief Valve for pressures up to 15,000 psi. Approved as a Safety Accessory toCategory IV of the Pressure Equipment Drective 97/23/EC.

RELIEF VALVE (H.P.)(RL25M)

1/4" Stainless Steel Manifold MountedStyle Relief Valve for pressures up to 15,000 psi. Approved as a SafetyAccessory to Category IV of the Pressure Equipment Drective 97/23/EC.

RELIEF VALVE (H.P.)(RL50)

1/2" Stainless Steel Relief Valve forpressures up to 15,000 psi. Approved as a Safety Accessory to Category IV ofthe Pressure Equipment Drective 97/23/EC.

RELIEF VALVE (H.P.)(RL50-G)

1/2" Stainless Steel Relief Valve withSoft Seats for pressures up to 6,000 psi with liquid or gas. Approvedas a Safety Accessory to Category IV of the Pressure Equipment Drective97/23/EC.

RELIEF VALVE (H.P.)(RL50M)

1/2" Stainless Steel Manifold MountedStyle Relief Valve for pressures up to 15,000 psi. Approved as a SafetyAccessory to Category IV of the Pressure Equipment Drective 97/23/EC.

RELIEF VALVE (H.P.)(RL75)

3/4" Stainless Steel Relief Valve forpressures up to 15,000 psi. Approved as a Safety Accessory to Category IV ofthe Pressure Equipment Drective 97/23/EC.

RELIEF VALVE (H.P.)(RL75-G)

3/4" Stainless Steel Relief Valve withSoft Seats for pressures up to 6,000 psi with liquid or gas. Approvedas a Safety Accessory to Category IV of the Pressure Equipment Drective97/23/EC.

CARTRIDGE RELIEFVALVE (H.P.) (PRV75C)

3/4" Stainless Steel Cartridge StyleRelief Valve for pressures up to 6,000 psi. Approved as a Safety Accessory toCategory IV of the Pressure Equipment Drective 97/23/EC.

RELIEF VALVE (H.P.)(RL100)

1" Stainless Steel Relief Valve forpressures up to 3,000 psi. Approved as a Safety Accessory to Category IV of thePressure Equipment Drective 97/23/EC.

RELIEF VALVE (H.P.)(RL100-G)

1" Stainless Steel Relief Valve withSoft Seats for pressures up to 3,000 psi with liquid or gas. Approvedas a Safety Accessory to Category IV of the Pressure Equipment Drective97/23/EC.