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Pipe force valve

Model: GPQDH741-P
Product introduction and use
1. background of technology development

Centrifugal and mixed flow liquid pumps start a large starting current in the motor, so it is easy to burn the motor. In the past, large resistance stacks and frequency converters were used to reduce current. They had large investment, large space occupation and large energy loss. Centrifugal, mixed flow and axial liquid pump in the stop pump, because the backwater will produce a huge impact water hammer, the destruction of the pump body, the bottom valve, resulting in the entire system failure. Therefore, it is very necessary to replace a buck starting device with a valve, and eliminate new valves of water hammer, check valve or bottom valve.

At present, domestic and foreign pump outlet valves are mainly: stop valve type pump control valve (multi-function pump control valve), hydraulic driven butterfly valve (hydraulic control butterfly valve). Because of the big resistance coefficient (1.5 ~ 2.2) and large caliber (especially DN1000mm) valve, the cut-off valve type pump control valve has a huge space, difficult to overcome in manufacturing and installation. The hydraulic driven butterfly valve is complicated and difficult to debug and maintain because of the existence of electricity and oil pressure system. The hidden danger of oil spill and so on can not be overcome.

2. functions and uses

The pipe force valve is installed at the outlet of the pump, which is mainly used in the transportation of water supply and drainage system in power, municipal, iron and steel, coking, petrochemical, chemical, water works, light textile, food processing and other industries. With the function of cut-off valve, hemispherical valve, butterfly valve, check valve and water hammer eliminator, it can effectively improve the safety and reliability of the system and meet the automatic control requirements of the outlet fluid of the pump when it is open and stop. Because the occupying space is relatively small, it is especially suitable for large diameter (DN1000mm) pipeline system.

Main design and manufacturing standards:：

Pressure test standard	GB/T13927-92 a (zero leakage)
Flanges standard	Steel flange GB9113.1-9113.4
Structural length standard	GB12221-89	Double flanged series
Design standards	GB/T12236-1989	Butterfly Check Valve
Use of material standards	AP16D-2002	Damped check valve
	GB/T12229-1989	Technical conditions for carbon steel castings
	GB/T12230-1989	Technical conditions for austenitic steel castings

Main technical performance:
1. Performance parameters

project	parameter
Nominal path（mm）	150-3000
Nominal pressure（MPa）	0.6-0.4
Leakage	Zero leakageGB/T13927 A级
Applicable temperature（℃）	0-80 0-120 0-200
Applicable medium	Water, sewage, sea water, oil, acid, lye, etc.

Main parts and components (diaphragm and piston type)

Name		Ordinary material	Chromium nickel stainless steel	Sea water resistant material
Valve shaft		Stainless steel 2Cr13	ZG1Cr18Ni9Ti	316L
Diaphragm / piston		Ding Qing rubber / stainless steel	EPDM/2Cr13	EPDM/316L
Valve body sealing surface		Semi ferritic high chromium steel D507 (H) Cemented carbide STL (Y)	ZG1Cr18Ni9Ti	ZcuZn38Mn2PB2 manganese brass
Seal up	Double seal	D507 (T) + butadiene rubber (X)	316L+EPDM three diethylene propylene rubber	T+EPDM three diethylene propylene rubber
		STL (H) + butadiene rubber (X)
	Hard seal	STL (Y) +A102 stainless steel electrode	316L+316L	T+316L
		D507 (H) + A102 stainless steel electrode

length	Shape size (reference value)									Connection size (standard value)						weight Kg
length	Shape size (reference value)									0.6MPa			1.0MPa
millimeter	L	L1	L2	H	H1	B	B1	B2	n-b	D	D1	n-d	D	D1	n-d
200	190	／	／	520	／	355	／	／	／	320	280	8-18	340	295	8-22	135
250	250	／	／	580	／	420	／	／	／	375	335	12-18	395	350	12-22	160
300	270	／	／	710	／	490	／	／	／	440	395	12-22	445	400	12-22	226
350	290	／	／	770	／	560	／	／	／	490	445	12-22	505	460	16-22	335
400	406	／	／	830	／	625	／	／	／	540	495	16-22	565	515	16-26	420
450	432	／	／	870	／	685	／	／	／	595	550	16-22	615	565	16-26	520
500	457	／	／	930	／	720	／	／	／	645	600	20-22	670	620	20-26	572
600	508	／	／	1090	／	910	／	／	／	755	705	20-26	780	725	20-30	815
700	610	300	240	1260	520	1050	760	650	4-30	860	810	24-26	895	840	24-30	996
800	660	360	270	1440	600	1170	820	720	4-30	975	920	24-30	1015	950	24-33	1650
900	711	420	300	1535	650	1315	950	820	4-30	1075	1020	24-30	1115	1050	28-33	1856
1000	811	460	350	1750	700	1460	1040	900	4-36	1175	1120	28-30	1230	1160	28-36	2110
1200	850	500	410	1960	800	1580	1240	1070	4-36	1405	1340	32-33	1455	1380	32-39	3050
1400	950	620	500	2250	900	1900	1400	1250	4-36	1630	1560	36-36	1675	1590	36-42	3200
1600	1100	750	600	2500	1020	2100	1520	1300	4-36	1830	1760	40-36	1915	1820	40-48	6100
1800	1200	860	700	2820	1150	2400	1620	1400	4-36	2045	1970	44-39	2115	2020	44-48	7150
2000	1300	980	820	3150	1250	2750	1800	1550	4-48	2265	2180	48-42	2325	2230	48-48	9280
2200	1450	1100	900	3500	1360	3000	1980	1700	4-48	2475	2390	55-42	2560	2440	52-62	12000
2400	1550	1250	1100	3800	1480	3200	2320	2020	4-48	2685	2600	56-42	2760	2650	56-56	15300
2600	1700	1400	1200	4100	1600	3500	2380	2050	4-48	2905	2810	60-48	2960	2850	60-48	18500
2800	1850	1550	1350	4550	1700	3800	2520	2240	4-48	3115	3020	64-48	3180	3070	64-48	22800
3000	2000	1680	1460	4900	1850	4100	2990	2660	4-48	3155	3220	68-48	3400	3290	68-48	26800

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