五中五复式表

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Hydraulic Blast Furnace Top Relief Valve

 Hydraulic Blast Furnace Top Relief Valve

Application
五中五复式表 Hydraulic blast furnace top relief valve is used at the top of blast furnace for protecting the equipment at the top of blast furnace. It can also be used as discharge device of industrial furnace gas. Hydraulic blast furnace top relief valve is vertically installed on the pipe. The opening and closing of the hydraulic blast furnace top relief valve is controlled by 8-12MPa hydraulic oil drive linkage mechanism. It is broadly used in steel plants, power plants, cement plants, chemical plants, metallurgic plants, coal mines, paper mills and other mining industries.

Parameters
Nominal pressure: 0.25 Mpa
Sealing test pressure: 0.275 Mpa
Strength test pressure: 0.375Mpa
Applicable temperature: ≤500 ℃
Applicable medium: air, gas containing dust, coal gas

Material of main parts
Valve seat, valve cover: cast steel, sealing surface is under surfacing ZD5MO.
Valve, linkages: welding parts

Cylinder parameters
DN (mm) Cylinder Diameter(mm) Cylinder stroke(mm) Working pressure (MPa) Port size
250 ~400 80 320 8 M27 X 2
500 ~700 100 420 8 M33 X 2
800 ~1000 160 690 12 M42 X 2
Main Dimensions / Unit: mm
DN D D1 b H L n- φd Weight(kg)
250 375 335 25 620 640 12-18 1010
300 440 395 25 640 760 12-22 1175
400 540 495 30 705 970 16-22 1400
500 645 600 30 810 1240 20-22 1560
600 755 705 35 870 1210 20-26 1795
700 860 810 35 920 1810 24-26 1960
800 975 920 40 1430 1940 24-30 2095
1000 1175 1120 50 1430 2060 28-30 2510

Features
1. Hydraulic blast furnace top relief valve adopts linkage mechanism that is turned over 90 degrees. Hydraulic blast furnace top relief valve is comprised of valve body, valve cover and linkage mechanism.
2. The seal structure is a combination of silicone rubber seal and alloy seal. Hard sealing surface is under surfacing ZD5Mo, and soft sealing material is silicone rubber. The hydraulic blast furnace relief valve has good sealing performance. In the condition of hard sealing, the leakage rate of the relief valve is D class of GB/T13927 standard.
3. Belleville springs on the valve cover enables the valve cover sealing surface and valve seat sealing surface to contact and keep certain pressure between surfaces.
4. The spring preload replaces the original counterweight, so the relief valve features light weight and easy installation. The spring is in the center of the valve cover, so the valve cover is free of tilt force, which improves the sealing effect of blast furnace and extends the service life of relief valve.
5. Self-locking linkage ensures the normal operation of the relief valve on pipes and also facilitates replacement of parts.

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