Butterfly Valve Series

• Cast Iron Butterfly Valves
• Ductile Iron Butterfly Valves
• Stainless Steel Butterfly Valves
• Triple Offset Butterfly Valves
• AWWA C504 Butterfly Valves
• Large Diameter Butterfly Valves
• Sanitary Butterfly Valves
• Flanged Butterfly Valves
• Lug Butterfly Valves
• Wafer Butterfly Valves
• High Vacuum Butterfly Valves

Product drawing»

Structural drawing»

Spring(Emergency Off) Quick Off Butterfly Valve

product drawing

The introduction and features of product

In gas cogeneration systems and heating steam turbine exhaust system, KD7T42/3P spring (emergency off) quick off valve is used as a system safety, has been widely used. Its close quickly, small flow resistance, globe can be sealed and other excellent properties make it can replace the original system design of electric globe butterfly valve and check valve. KD7T42/3P spring (emergency off) quick off valve is mainly used in thermal power plant units and gas heating generators as the emergency off valve for the safety protection of system. The main features are: 1, the quick off time is up to 0.5 seconds, the emergency off is safe and reliable. 2, three eccentric metal seal structure, open and closed is light and flexible, sealing with zero leakage. 3, The room temperature media can choose double eccentric soft sealing structure, and the cost is low, the sealing is reliable. 4, the buffer of the end of the valve is effectively prevent the impact of valve inertia. 5, it can be achieved quick off with the spring, or the accumulator, both forms are similar, safe and reliable.

Dimensions & constructral diagram

Main technical parameter and standard

nominal pressure（MPa）		0.6	1.0	1.6	2.5
nominal diameter（mm）		400～1600 3.75
test pressure（MPa）	intensity test	0.9	1.5	2.4	2.75
	sealing test	0.66	1.1	1.76	2.75
working pressure（MPa）		0.6	1.0	1.6
applicable medium		water,steam,gas	suitable temperature	Soft seal：≤80℃；hard seal：≤425℃
design reference：GB/T 12238、 JB/T 5299、 JB/T 8527， flange connection：GB/T 17241、 GB/T 9113， face to face dimension：GB/T 12221， pressure test：GB/T 13927

The main external and connection dimensions of KD7T42/3P(unit：mm)

DN	P	L	L1	L2	H1	H2	flange connection dimensions	Remarks
400	0.6	216	966	1449	320	780	GB/T17241 DB/T9113
	1.0	216	966	1449	330	785
	1.6	216	966	1449	345	800
450	0.6	222	966	1449	370	805
	1.0	222	966	1449	380	810
	1.6	222	966	1449	395	835
500	0.6	229	966	1449	400	898
	1.0	229	966	1449	410	898
	1.6	229	966	1449	425	898
6000	0.6	267	966	1449	440	898
	1.0	267	966	1449	460	920
	1.6	267	1150	1820	470	1020
700	0.6	292	966	1449	436	950
	1.0	292	1150	1820	550	1075
	1.6	292	1150	1820	570	1100
800	0.6	318	1150	1820	625	1142
	1.0	318	1150	1820	640	1158
	1.6	318	1150	1820	660	1183
900	0.6	330	1150	1820	700	1190
	1.0	330	1150	1820	710	1210
	1.6	330	1150	1820	725	1239
1000	0.6	410	1150	1820	760	1250
	1.0	410	1150	1820	770	1275
	1.6	410	1360	2180	790	1306
1200	0.6	470	1150	1820	875	1360
	1.0	470	1360	2180	890	1385
	1.6	470	1360	2180	915	1418
1400	0.6	530	1360	2180	1000	1478
	1.0	530	1360	2180	1020	1510
	1.6	530	1360	2180	1045	1546
1600	0.6	600	1360	2180	1120	1599
	1.0	600	1360	2180	1140	1639
	1.6	600	1610	2520	1170	1738

Note: it can produce DN250-3000(GB12221-89) long series according to customers’ requirements,from DN1200-3000 with bottom foot must be marked.

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