D71JWith rubber sealing surface and rubber lining butterfly plate, the valve shaft is not in contact with the fluid medium in the cavity. It has tight sealing performance and long service life. It can be used for quick cut-off or flow regulation. It is suitable for occasions requiring reliable sealing and good regulating characteristics.

1. Soft seal, low torque and large flow rate;
2. The sealing surface and butterfly plate are rubber lined to ensure that the valve shaft is not in contact with the fluid medium in the cavity and is more corrosion-resistant;
3. The valve seat is inlaid in the groove of the valve body with elastic strip;
4. The special transition curve at the joint of shaft head and butterfly plate and reasonable interference of valve seat; it has bidirectional sealing function and absolutely ensures zero leakage inside and outside the valve;

​D71JMaterials of main parts and components of butterfly valve with fully lined rubber handle

1	valve body	Cast iron, ductile iron, carbon steel, stainless steel
2	Disc	Cast iron, ductile iron, carbon steel, stainless steel, carbon steel completely covered with rubber or fluoroplastics
3	Stem	Carbon steel nickel phosphorus, stainless steel
4	Seat sealing ring	NR, Cr, NBR, EPDM and FKM
	Handle	Aluminum alloy, carbon steel

D71JMain application of double clip butterfly valve with rubber lining

Material code of sealing ring	Applicable temperature	Applicable media
NR	≤85℃	Water, air, acid and alkali
CR	≤85℃	Water, gas, acid and alkali
NBR	≤100℃	Water, oil
EPDM	≤120℃	Water, steam, general acid and alkali
FKM	≤150℃	Water, steam, strong acid and alkali

 

Test lining layer: electric spark detection
The test and inspection shall be in accordance with GB / t13927 standard
Nominal pressure: PN (MPA)
Valve body: PN × 1.5
Seal: PN × 1.1
Design and manufacture: gb12238
Structure length: gb12221 (20 series)
Flange connection size: gb4216

D71JMain connection dimensions of double clip butterfly valve with rubber lining(mm)
Nominal diameter DN	Nominal pressure MPa	working pressure MPa	L	D	D1	n-Φd	H1	H2	S	H3	quality
40	1.6 1.0	1.6 1.0	33	150	110	4-18	55	100	235	27	2
50			43	165	125	4-18	64	120	235	27	2.5
65			46	185	145	4-18	80	120	235	27	4.5
80			46	200	160	8-18	112	130	265	27	5.5
100			52	220	180	8-18	90	145	265	27	6.5
125			56	250	210	8-18	112	160	365	32	11.5
150			56	285	240	8-22	135	175	365	32	13.5