Worm gear 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℃. Worm gear hard seal butterfly valve 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 to 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. Disc overlay with STL, has 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（mm)	50～2000		50～1600
Nominal Pressure PN（MPa)	0.6	1.0	1.6
Seal test(MPa)	0.66	1.1	1.76
Strength test(MPa)	0.9	1.5	2.4
Applicable temperature	Nitrile rubber: -40℃～90℃, fluororubber: -20℃～200℃
Applicable medium	Water, air, gas, oil and other weak corrosive fluid
Leakage rate	GB/T13927-92

 
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 (unit: mm)

Nominal diameter(DN)	Dimensions			Flange sizes & bolt specifications
				1.0MPa		1.6MPa		2.5MPa
	L	H	H1	D1	4-Ф－M	D1	4-Ф－M	D1	4-Ф－M
50	43	350	112	125	Ф18	125	Ф18	125	Ф18
65	46	370	115	145	Ф18	145	Ф18	145	Ф18
80	49	380	120	160	Ф18	160	Ф18	160	Ф18
100	56	420	138	180	Ф18	180	Ф18	190	Ф23
125	64	460	164	210	Ф18	210	Ф18	220	Ф27
150	70	555	175	240	Ф23	240	Ф23	250	Ф27
200	71	605	208	295	M20	295	M20	310	M24
250	76	680	243	350	M20	355	M24	370	M27
300	83	800	283	400	M20	410	M24	430	M27
350	92	835	310	460	M20	470	M24	490	M30
400	102	915	340	515	M24	525	M27	550	M33
450	114	960	380	565	M24	585	M27	600	M33
500	127	1020	410	620	M24	650	M30	660	M33
600	154	1225	470	725	M27	770	M33	770	M36
700	165	1355	550	840	M27	840	M33	875	M39
800	190	1470	640	950	M30	950	M36	990	M45
900	203	1545	710	1050	M30	1050	M36	1090	M45
1000	216	1795	770	1160	M33	1170	M39	1210	M52
1200	254	1965	890	1380	M36	1390	M45	1420	M52