Extraction Valve Steam Turbine

Turbine extraction check valve description:

Installed in the extraction pipeline of 200MW, 300MW, 600MW and 1000MW units, once the pneumatic device components receive the gas reverse flow signal, it will act quickly to ensure that the valve is tightly closed, quickly isolate the steam turbine, and provide maximum protection to the steam turbine or steam extraction system.

Turbine extraction check valve structural drawing：

Turbine extraction check valve material：

serial number	Part Name	Material
1	valve body	WCB/WC6
2	Disc	25/12Cr1MoVA
3	rocker	WCB/WC6
4	shaft	WCB/WC6
5	Gasket	1Cr17Ni2/20Cr1Mo1V1A
6	cap	1Cr13/ Flexible graphite
7	Pneumatic device

Turbine extraction check valve main size：

PN 20（CLASS 150）

Model Specifications（WCB）	L	L1	d	D	H	H1	weight (kg)
H664H20-150	483	324	145	169	342	/	112
H664H20-200	526	374	195	221	404	/	137
H664H20-250	559	410	248	278	439	/	185
H664H20-300	597	429	298	332	486	/	229
H664H20-400	698	515	395	430	574	928	429
H664H20-450	740	510	428	476	525	755	620
H664H20-500	790	545	488	540	570	855	759
H664H20-550	889	523	530	582	558	988	1015
H664H20-600	915	553	600	652	630	1130	1125
H664H20-700	1041	685	685	747	695	1306	1258
H664H20-750	1160	635	730	788	775	1295	1669
H664H20-800	1295	645	780	842	807	1349	1788

PN 40

Model Specifications（WCB）	L	L1	d	D	H	H1	weight (kg)
H664H40-350	711	475	332	378	564	920	435

PN 50（CLASS 300）

Model Specifications（WCB）	L	L1	d	D	H	H1	weight (kg)
H664H50-200	526	390	195	239	435	/	236
H664H50-300	610	445	300	354	480	/	376
H664H50-400	838	490	380	436	620	940	674

PN 64

Model Specifications（WCB）	L	L1	d	D	H	H1	weight (kg)
H664H64-100	368	274	94	120	313	/	78

PN 100

Model Specifications（WCB）	L	L1	d	D	H	H1	weight (kg)
H664H100-175	526	385	160	198	459	/	225
H664H100-200	610	410	200	244	465	/	277
H664H100-250	680	440	250	302	525	/	385
H664H100-500	1020	560	480	580	800	/	1537

CLASS 150

Model Specifications（WCB）	L	L1	d	D	H	H1	weight (kg)
H664H150Lb -36＂	1448	700	880	934	930	1466	2043
H664H150Lb -42＂	1600	755	1000	1072	1045	2080	2714

CLASS 400

Model Specifications（WCB）	L	L1	d	D	H	H1	weight (kg)
H664H400Lb -20＂	978	550	480	536	785	1005	1230
H664H400Lb -24＂	1130	604	570	636	875	1185	1675
H664H400Lb -28＂	1346	700	660	740	942	1365	2416

CLASS 600

Model Specifications（WCB）	L	L1	d	D	H	H1	weight (kg)
H664H600Lb -6＂	526	341	140	170	414	/	165
H664H600Lb-12＂	738	445	288	340	541	706	577
H664H600Lb -14＂	788	470	327	383	615	820	680

Steam turbine extraction valve Design Features

Closing time is less than 0.5s

Valve seat sealing surface inclined design

The valve body cavity adopts a streamlined design

Actuator and valve closing parts are relatively independent

Closing rod opening with restriction mechanism

Steam turbine extraction valve Manufacturing range

Diameter: 2"~24"

Pressure: Ansey 600LB - 4500LB

Diameter: 576°C

Connection method: flange, welding

Operation mode: pneumatic, hydraulic

Turbine extraction check valve application

The extraction check valve is a valve used to prevent the backflow of the working fluid in the extraction pipeline of the steam turbine. Each extraction check valve is fully designed for the specified extraction parameters.

working medium

Steam, gas. If with actuator - a temperature not exceeding 80 ° C;

Connection to pipes

Flanged ends meet EN 1092-1, ASME B16.5, ASME B16.47 standards,

Face to face dimensions according to EN 558 series 14, 15

Welded ends to EN 12627, ASME B16.25, end-to-end dimensions to EN 12982

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