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First, rubber stopper valve purposes:

The valve is designed to control the general corrosive medium, the body cavity surface covered with a variety of rubber to choose from, suitable for different working temperature and fluid pipe, with high strength, good corrosion resistance.

Second, rubber stopper valve material:

Body	Cast iron, ductile iron, carbon steel, stainless steel
Butterfly plate	Cast iron, ductile iron, carbon steel, stainless steel, carbon steel fully coated rubber or fluoroplastic
Valve stem	Carbon steel nickel-phosphorus, stainless steel
Seat ring	Natural rubber NR, neoprene CR, nitrile rubber NBR, EPDM rubber EPDM, fluorine rubber FKM
Handwheel	Cast iron, carbon steel

Third, the rubber stopper valve test:

Lining: Spark
testing and inspection according to GB / T13927 standard
Nominal pressure: PN (MPa)
Body: PN × 1.5
Seal: PN × 1.1

Fourth, the main size parameters:

Nominal diameter DN	Nominal pressure MPa	Working pressure MPa	L mm	D mm	D1 mm	n-Φd mm	H1 mm	H2 mm	Do mm	quality
15	1.6 1.0	1.6 1.0	130	95	65	4-14	213	232	100	4
20			150	105	75	4-14	224	246	100	6
25			160	115	85	4-14	240	272	120	8
32			180	140	100	4-18	262	285	120	10.5
40			200	150	110	4-18	283	310	140	16.5
50			2360	165	125	4-18	311	345	140	18.
65			290	185	1451	4-18	366	410	160	26
80			310	200	60	6 / 2-18	388	430	200	36.5
100			350	220	180	6 / 2-18	463	535	280	58
125			400	250	210	6 / 2-18	495	575	380	64
150			480	285	240	6 / 2-22	560	60	320	85
200			495	340	295	6 / 2-22	615	715	360	155
250			622	405	355	10 / 2-22	790	935	500	243
300			698	460	410	10 / 2-22	908	1100	500	295

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