Wafer hard seal butterfly valve, based on imported advanced technique, adopts fine J shape elastic seal ring and triple offset multilayer metal hard sealing structure. Applicable temperature belows 425℃. It is widely used to regulate flow or closure medium in metallurgy, petroleum, power and other industries. The valve utilizes triple offset sealing structure. Valve seat and disc made of stainless steel with different hardness, have good corrosion resistance and long service life. The valve has bi-directional sealing, according with GB/T13927-92 pressure test standard.

 

Characteristics of wafer hard seal butterfly valve

1. The valve adopts triple offset sealing structure which cannot cause abrasion to valve seat and disc, having good seal.

2. Seal ring made of stainless steel, combines with the advantages of metal hard seal and elastic seal. No matter under low or high temperature, seal ring has good seal.

3. The seal ring of the disc is overlay with STL, with abrasion resistance and long service life.

4. Large size butterfly valve, utilizing lattice structure, has high strength, large flow area and small flow resistance.

5. The valve has bi-directional seal. It can be installed at any position without the limitation of medium flow and space.

6. Actuating device adopts multistage installment which is convenient to use.

 

Technical parameter

Nominal diameter DN(mm)	50～2000
Nominal Pressure PN(MPa)	0.6	1.0	1.6	2.5
Seal test(MPa)	0.66	1.1	1.76	2.75
Strength test(MPa)	0.9	1.5	2.4	3.75
Applicable temperature	Carbon steel: -29℃～425℃; stainless steel: -40℃～650℃
Applicable medium	Water, air, gas, oil and weak corrosive fluid
Leakage rate	GB/T13927-92
Driving mode	Manual, worm gear, pneumatic, electric

 
Components materials

Components	Materials
Valve body	WCB, alloy steel, stainless steel, QT450-10
disc	WCB, alloy steel, stainless steel, QT450-10
Valve shaft	2Cr13 stainless steel, alloy steel
Seal ring	Stainless steel
Packing	Flexible graphite

 
Standards 

Manufacturing standard	JB/T 8527-97
Flange standard	GB9113-2000
Face to Face standard	GB12221-89
Examination standard	GB/T 13927-92

 
 
  Connection dimensions

Nominal diameter(DN)	Dimensions				Flange sizes & bolt specifications
					1.0MPa			1.6MPa			2.5MPa
	L	L2	H	H1	D1	Z-D	A	D1	Z-D	A	D1	Z-D	A
50	43	265	350	112	125	4-18	90℃	125	4-18	90℃	125	4-18	90℃
65	46	265	370	115	145	4-18	90℃	145	4-18	90℃	145	4-18	90℃
80	49	320	380	120	160	8-18	45℃	160	8-18	45℃	160	8-18	45℃
100	56	320	420	138	180	8-18	45℃	180	8-18	45℃	190	8-22	45℃
125	64	340	460	164	210	8-18	45℃	210	8-18	45℃	220	8-26	45℃
150	70	390	555	175	240	8-22	45℃	240	8-22	45℃	250	8-26	45℃