China Flat Plate Gate Valve Suppliers, Manufacturers, Factory

Features of flat plate gate valve

1. The valve seat adopts an O-ring seal and a floating seat structure that applies pre-tightening force to seal the inlet and outlet of the flat gate valve in both directions; and the opening and closing torque of this structure are only 1/2 of that of ordinary valves, which can achieve easy opening and closing. Close the valve

2. When fully opened, the channel is smooth and straight, the flow resistance coefficient is very small, and there is no pressure loss, and the pipeline can be cleaned by the hairball

3. The packing structure with self-sealing capability is adopted, without frequent adjustment, the opening and closing are extremely light, and the sealing performance is reliable. The stuffing box is equipped with an auxiliary sealing grease injection structure, the sealing performance is absolutely reliable, and it can truly achieve zero leakage; it solves the general-purpose The most prone to leakage of valve packing

4. When the flat gate valve is closed, the high pressure in the cavity can be automatically removed to ensure safe use

5. Fully enclosed structure, good protection performance, can adapt to all-weather requirements

6. The sealing structure of the valve seat should be elastic and pre-tightened, and the upstream and downstream sealing seats are sealed at the same time. The valve seat and the seal are always face-to-face sealing.

7. The valve seat has a self-cleaning function and is not directly washed by the airflow during the opening or closing of the valve. The valve seat should be made of lubricated, non-wearing material.

8. The failure of the valve actuator will not affect other parts of the valve. Repair and replacement work can be carried out without removing the valve.

Product parameter of flat plate design gate valve flange end

Nominal diameter: DN50-DN1000

Pressure: Class150~900/PN1.0~16.0MPa

Working temperature: -29~121℃

Medium: Oil, natural gas, water, oil products

Design standard: JB/T 5298; API 6D

Face to face accordance: JB/T 5298; API 6D

End collection: JB/T 79; ANSI B16.5

Inspection & test: JB/T 5298; API 6D

Item	Material
Item	JB/T7298		API 6D
body/bonnet	WCB	WCB	A352-LCB	A351-CF8M
disc	2Cr13+ENP	20CrMoV+STL	ANSI 410+ENP	ANSI 316+ENP
stem	2Cr13	2Cr13	A182-F6a	A182-F316S
seat	25+PTFE	20CrMoV+STL	A105+PTFE	A182-F316+PTFE
packing	NBR/FPM	flexible graphite		PTFE
mat	18-8/flexible graphite
bolt	35	35CrMo	A193-B7M	A193-B8
temperature	-29~250℃	-29~550℃	-46~250℃	-40~200℃
medium	water, oil	steam, oil	Propane, ethylene	nitrose

Size chart of flat plate item gate valve

1.6MPa	DN	L	D	D1	D2	Do	f	b	H	H1	n-Φd
RF	50	178	160	125	100	250	3	16	584	80	4-Φ18
	65	190	180	145	120	250	3	18	634	95	4-Φ18
	80	203	195	160	135	250	3	20	688	100	8-Φ18
	100	229	215	181	155	300	3	20	863	114	8-Φ18
	125	254	245	210	185	350	3	22	940	132	8-Φ18
	150	267	280	240	210	350	3	24	1030	150	8-Φ23
	200	292	335	295	265	350	3	26	1277	168	12-Φ23
	250	330	405	355	320	400	3	30	1491	203	12-Φ25
	300	356	460	410	375	450	4	30	1701	237	12-Φ25
	350	381	520	470	435	500	4	34	1875	265	16-Φ30
	400	406	580	525	485	305	4	36	2180	300	16-Φ30
	450	432	640	585	545	305	4	40	2440	325	20-Φ34
	500	457	705	650	608	305	4	44	2860	360	20-Φ41
	600	508	840	770	718	305	5	48	3450	425	20-Φ41
	700	610	910	840	788	305	5	50	3960	460	24-Φ41
	800	660	1020	950	898	305	5	52	4550	512	24-Φ41
	900	711	1120	1050	998	250	5	54	5250	565	28-Φ48
	1000	811	1250	1170	1110	250	5	56	5870	630	28-Φ18
2.5MPa	50	178	160	125	100	250	3	20	584	80	4-Φ18
RF	65	190	180	145	120	300	3	22	634	95	8-Φ18
	80	203	195	160	135	350	3	22,	388	100	8-Φ18
	100	229	230	190	160	350	3	24	863	114	8-Φ23
	125	254	270	220	188,	350	3	28	940	132	8-Φ25
	150	267	300	250	218	400	3	30	1030	150	8-Φ25
	200	292	360	310	278	450	3	34	1277	168	12-Φ25
	250	330	425	370	332	500	3	36	1491	203	12-Φ30
	300	356	485	430	390	305	4	40	1701	237	16-Φ30
	350	381	550	490	448	305	4	44	1875	265	16-Φ34
	400	406	610	550	505	305	4	48	2180	300	16-Φ34
	450	432	660	600	555	305	4	50	2440	325	20-Φ34
	500	457	730	660	610	305	4	52	2860	360	20-Φ41
	600	508	840	770	718	305	5	56	3450	425	20-Φ41
	700	610	955	875	815	305	5	60	3960	460	24-Φ48
	800	660	1070	990	930	305	5	64	4550	512	24-Φ48
	900	711	1180	1090	1025	-	5	66	5250	595	28-Φ54
	1000	811	1305	1210	1140	-	5	68	5870	660	28-Φ48