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First, the product overview:

This series of valve connection sub-flange, welding two kinds of driving methods are manual, electric two. The valve is suitable for working temperature ≤ 425 ℃ and ≤ 550 ℃, the working medium is water, steam or air pipe, as the opening and closing device; especially suitable for thermal power plant condensing and vacuum vacuum system, vacuum isolation seal.

Second, the structural features:

1, designed a vacuum sealed packing room, the system isolated from the atmosphere, with good environmental performance.
2, selection of sophisticated materials, all relevant standards at home and abroad, the overall high-quality materials.
3, advanced and reasonable pairing pair, improve the sealing performance, long service life.
4, the opening and closing pieces of parallel gate with two-way flexible seal, small friction, easy opening and closing, easy maintenance, reliable sealing, excellent performance.
5, the stem by quenching and nitriding surface treatment, good corrosion resistance, scratch resistance and wear resistance.
6, flange gasket composite materials, expansion coefficient, airtight, and ensure the system and the atmosphere isolated and reliable.

Third, the test pressure:

Nominal pressure PN / MPa	Test pressure / MPa
Nominal pressure PN / MPa	Shell strength test	Seal test	Seal test
1.0	1.5	1.1	1.1
1.6	2.4	1.8	1.8
2.5	3.8	2.8	2.8
4.0	6.0	4.4	4.4
6.4	8.6	7.0	7.0
10.0	15.0	11.0	11.0

Fourth, the scope of application:

product type	Suitable media	Applicable temperature / ℃
NKZ41H NKZ44H NKZ944H-C type NKZ941H	Water, steam, air	≤425
NKZ41H (Y) NKZ44H (Y) -I type NKZ944H (Y) -I type NKZ941H (Y)	Water, steam, air	≤550

Fifth, the main components and parts:

Part Name	Body, bonnet	Valve stem	gate	Sealing surface	Stem nut	filler	fastener
NKZ44H NKZ41H-C type NKZ944H-C type NKZ941H	WCB	2Crl3	25	H: Alloy steel	Aluminum bronze	Expanded composite graphite	High-quality carbon steel
NKZ44 NKZ41Y-I type NKZ944-I type NKZ941	Chrome-molybdenum steel	20CrlMo1VA 38CrMoAlA	Chrome-molybdenum steel	Y: Carbide	Aluminum bronze	Expanded composite graphite	Chrome-molybdenum steel

Six , size and weight:

DN / mm	PN / MPa	The main dimensions and connection dimensions / mm									Valve weight / kg	Attached flange size / mm
DN / mm	PN / MPa	L	H	D	D1	D2	b	f	zd	W	Valve weight / kg	h	D0	Dn
50	1.0	250	345	160	125	100	16	3	4-18	250	28	45	49	58
65		270	395	180	145	120	18	3	4-18	250	40	48	64	75
80		280	425	195	160	135	20	3	4-18	300	55	50	78	97
100		300	510	215	180	155	20	3	8-18	300	72	52	96	110
125		325	570	245	210	185	22	3	8-18	350	106	60	120	136
150		350	725	280	240	210	24	3	8-18	350	146	60	145	163
200		400	820	335	295	265	26	3	8-18	400	220	62	202	223
250		450	890	390	350	320	28	3	12-23	400	315	62	225	278
300		500	1070	440	400	368	28	3	12-23	450	398	65	303	330
350		550	1320	500	460	428	30	4	16-23	550	530	65	351	382
400		600	1450	565	515	482	32	4	16-25	550	690	65	398	432
450		650	1560	615	565	532	32	4	20-25	600	870	70	460	485
500		700	1720	670	620	585	34	4	20-25	650	1080	78	500	535
600		800	1880	780	725	685	36	5	20-30	700	1350	90	600	636
700		900	2085	895	840	800	40	5	24-30	750	1950	90	690	726
800		1000	2590	1010	950	905	44	5	24-34	800	2500	106	790	826
50	1.6	250	345	160	125	100	16	3	4-18	250	28	48	49	58
65		270	395	180	145	120	18	3	4-18	250	40	50	64	75
80		280	425	195	160	135	20	3	8-18	300	58	52	78	91
100		300	510	215	180	155	20	3	8-18	300	75	52	96	110
125		325	570	245	210	185	22	3	8-18	350	110	60	120	136
150		350	725	280	240	210	24	3	8-23	350	150	60	145	163
200		400	820	335	295	265	26	3	12-23	400	223	62	201	223
250		450	890	405	355	320	30	3	12-25	450	326	68	253	278
300		500	1070	460	410	375	30	3	12-25	550	432	70	303	330
350		550	1320	520	470	435	34	4	16-25	600	572	78	351	382
400		600	1450	580	525	485	36	4	16-30	650	740	90	398	432
450		650	1560	640	585	545	40	4	20-30	700	955	95	450	485
500		700	1720	705	650	608	44	4	20-34	750	1195	98	500	535
600		800	1880	840	770	718	48	5	20-41	800	1455	105	600	636
700		900	2085	g10	840	788	50	5	24-41	850	2110	110	690	726
800		1000	2590	1020	950	898	52	5	24-41	950	2630	115	790	826

DN / mm	PN / MPa	The main dimensions and connection dimensions / mm									Valve weight / kg	Attached flange size / mm
DN / mm	PN / MPa	L	H	D	D1	D2	b	f	Zd	W	Valve weight / kg	h	D0	Dn
50	2.5	250	345	160	125	100	20	3	4-18	250	30	48	49	64
65		270	395	180	145	120	22	3	8-18	250	43	52	66	82
80		280	425	195	160	135	22	3	8-18	300	60	55	78	95
100		300	510	230	190	160	24	3	8-23	300	79	62	100	117
125		325	570	270	220	188	28	3	8-25	350	114	68	125	144
150		350	725	300	250	218	30	3	8-25	350	157	72	151	172
200		400	820	360	310	278	34	3	12-25	400	243	60	201	223
250		450	890	425	370	332	36	3	12-30	450	345	85	253	278
300		500	1070	483	430	390	40	4	16-30	550	455	92	303	330
350		550	1320	550	4g0	448	44	4	16-34	650	615	98	351	382
400			1450	610	550	505	48	4	16-34	700	7g4	115	398	432
450		650	1560	660	600	555	50	4	20-34	750	1018	115	450	483
500		700	1720	730	660	610	52	4	20-41	800	1250	120	498	535
600		800	1880	840	770	718	56	5	20-41	850	1528	130	598	636
700		900	2085	955	875	815	60	5	24-48	900	2265	140	688	726
800		1000	2590	1070	990	930	64	5	24-48	1000	2847	150	788	826

DN / mm	PN / MPa	The main dimensions and connection dimensions / mm											Valve weight / kgt	Attached flange size / mm
DN / mm	PN / MPa	L	H	D	D1	D2	b	f	D6	f2	zd	W	Valve weight / kgt	h	D0	Dn
50	4.0	250	345	160	125	100	20	3	88	4	4-18	300	35	48	48	64
65		270	395	180	145	120	22	3	110	4	8-18	300	49	52	66	82
80		280	425	195	160	135	22	3	121	4	8-18	350	65	58	78	95
100		300	510	230	190	160	24	3	150	4.5	8-23	350	87	68	100	117
125		325	570	270	220	188	28	3	176	4.5	8-25	400,	124	68	125	144
150		350	725	300	250	218	30	3	204	4.5	8-25	400	172	72	151	172
200		400	820	375	320	282	38	3	260	4.5	12-30	450	275	88	19g	223
250		450	890	445	385	345	42	3	313	4.5	12-34	550	392	102	251	278
300		500	1070	510	450	408	46	4	364	4.5	16-34	650	515	116	301	330
350		550	1320	570	510	465	52	4	422	5	16-34	750	684	120	34g	382
400		600	1450	655	585	535	58	4	474	5	16-41	850	902	142	396	432

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