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Signal gate valve and signal butterfly valve are used in automatic spraying water pipeline in fire protection system to monitor the water supplying pipeline and can indicate the valve's opening in a long distance.Rising stem gate valve and opening indicator gate valve are often used in fire protection system,and if the installation position is high to the ground,rising stem gate valve is used and can show the valve's opening clearly and if the installation position is low,opening indicator gate valve is used

No.	Part	Material
1	Transmission cap	ductile cast iron, cast steel
2	Handwheel	Ductile iron
3	Dust proof gasket	Plastic
4	Gasket	Buna-N rubber or EPDM
5	Thrust bearing	Gunmetals
6	Cover	Grey cast iron, ductile cast iron, cast steel
7	Bolt	Carbon steel or stainless steel
8	Body	Grey cast iron, ductile cast iron,c ast steel
9	Copper nut	Gunmetals
10	Stem	Stainless steel
11	Disc	Ductile cast iron packed with rubber or EPDM outside