Blackhall Engineering: Larner-Johnson control valves, gate valves, cryogenic and steam valves

Blackhall Engineering valves: Larner-Johnson needle valves up to 50 bar, discharge and gate valves for water mains, cryogenic valves to -196 °C, Taylor steam gate valves and Shaw bellows sealed valves. Quotation per project.

Larner-Johnson needle flow control valves

Larner-Johnson needle valves control flow and pressure on water mains, dams and hydropower plants. The design is all-metal and pilot operated, with an air belt as standard. Series 3137 regulates in line, Series 3168 sustains pressure and Series 3078 is an angle pattern float valve.

Pressure up to 50 bar
Sizes DN80–DN2500
Velocity up to 12 m/s
Series 3137, 3168 and 3078

Fixed cone and submerged discharge valves

The Series 3300 fixed cone valve controls free discharge at the base of a dam, driven through a gearbox and twin universal joint. The Series 3200 submerged discharge valve releases flow under water into a stilling well and lowers noise. Fixed cone valves also serve turbine bypass duty.

Series 3300: up to 16 bar
Series 3300: DN200–DN4000
Series 3200: up to 20 bar
Discharge coefficient k=1.7

Metal seated gate valves, Series 3411 and 3400

Blackhall metal seated gate valves isolate large water mains and are designed for a 100 year asset life. Series 3411 has parallel faces in DN900–DN2700; Series 3400 is a wedge design in DN600–DN2000. The through bore version is piggable where a butterfly valve has its limits.

Pressure up to 26 bar
Series 3411: DN900–DN2700
Series 3400: DN600–DN2000
100 year asset life

Cryogenic gate, globe and vacuum jacketed valves

Blackhall cryogenic valves handle oxygen, nitrogen, argon and LNG down to -196 °C. Series 2000 and 9000 cover gate and globe valves, Series 9000 being the air separation range, in regulating, check and stop check types. Series 2027 and 2028 are vacuum jacketed, the latter with a bellows.

-196 °C to +65 °C
Sizes DN15–DN200
Class 150–1500, PN16–PN100
Series 2000, 9000, 2027, 2028

Emergency shut-off and relief valves

Series 2020 emergency shut-off valves close by spring force on loss of power or control signal. The EPD protects cryogenic tanks and closes in under 1 second. Series 2012 and 2013 relief valves vent from 0 to 40 bar, and the Series 1020 shut-off valve is rated for 320 bar.

Series 2020: PN32
EPD burst disc 3.5–40 bar
Relief from 0 to 40 bar
Series 1020: 320 bar

Taylor steam gate valves and blowdown valves

Taylor parallel slide gate valves seal without wedging, with no stress between the discs in travel. The bolted bonnet range covers Class 150–1500 and DN15–DN900; the pressure sealed bonnet range covers Class 600–2500 and DN80–DN600. Boiler blowdown valves use rack and pinion or link-type operation.

Bolted bonnet DN15–DN900
Pressure seal DN80–DN600
Class up to 2500
Boiler safety valves to 25.4 bar

Shaw bellows sealed valves for chlorine and HF

Shaw bellows sealed valves serve chlorine, hydrogen fluoride and hydrogen cyanide where leakage is not acceptable. The M62–M67 bellows has a minimum three-ply construction and a minimum life of 20,000 cycles at maximum conditions. The HFA LM63XX version is designed for HF alkylation duty.

Class CL150–CL600
Pressure PN16–PN100
Three-ply bellows minimum
20,000 cycle bellows life

Automatic recirculation valves for pump protection

Blackhall automatic recirculation valves keep minimum flow through a centrifugal pump at low or zero demand. Series 6500 handles a bypass differential up to 25 barg, while Series 6600 works in on-off and semi-modulating duty up to Class 2500. Each valve is matched to the pump operating profile.

Series 6600: Class 150–2500
Series 6600: PN16–PN420
Sizes DN40–DN450
Series 6500: up to 25 barg

How to choose Blackhall valves

Selection starts with the duty. Water mains, dams and hydropower plants use Larner-Johnson needle valves up to 50 bar and DN2500, Series 3300 fixed cone valves and Series 3411 and 3400 gate valves.

Cryogenic gases use Series 2000 and 9000 valves rated to -196 °C. Steam uses Taylor gate valves, chlorine and hydrogen fluoride use Shaw bellows sealed valves, and pumps use Series 6500 and 6600 recirculation valves.

Next come pressure class, size, body material and end connections. Each valve has a unique serial number, and all shell and trim materials are traceable to the mill material document.

Valves for water mains and dams

Larner-Johnson valves are built in ductile iron, steel and aluminium bronze. Fixed cone valves sit at the base of a dam, on turbine bypass lines and on continuous discharge duty; the submerged discharge valve releases flow under water into a stilling well and lowers noise.

Metal seated gate valves are also built in a through bore version that is piggable. On large diameters they replace a butterfly valve where it has limits.

Cryogenic and high-pressure gas valves

Cryogenic gate valves are made in bronze, stainless steel and Monel. Vacuum jacketed valves give zero leakage and stay frost free, and relief valves are degreased for LOX service as standard.

The Series 1020 shut-off valve serves hydrogen, oxygen and industrial gas from -269 °C to +50 °C. Before dispatch, cryogenic valves pass helium leak detection and pressure cycle testing.

Steam, chemical, pump and marine service

Boiler safety relief valves are rated up to 350 °C. Shaw valves are independently approved to Eurochlor and UOP requirements; the M56–M61 packed gland valves use PTFE packing, with graphite for higher temperatures.

Blackhall has made automatic recirculation valves for pump protection since the early 1970s. Series 4100 and 4400 marine gate valves cover DN15–DN1400.

The manufacturer

Blackhall Engineering Ltd was founded in Yorkshire in 1965 and has its headquarters in Brighouse, West Yorkshire, England. The company acquired the Larner-Johnson IP in 1989.

In 2007 Blackhall acquired Taylor Shaw; Taylor steam valves have been made since 1904. Sizes and lead time are stated in the quotation for each project.

Blackhall Engineering and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of Blackhall Engineering and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.