1 Pressure reducing
Pressure reducing range is large, single stage valve can reduce pressure from 6.3MPa to 1.0 MPa, no cavitation, no running noise. In the high water head hydropower station, water from the pressure pipe, can be supplied to low-pressure water supply system after the pressure reducing of this valve.

2 Reservoir water level regulation and sand washing
When discharged into the atmosphere, the water stream first shrinks and then diffuses at a wide cone angle and breaks down into a thin sprayed state. If suppression of water flow is required, a beam device may be installed, which not only mixes air and water but also concentrates the flow.

3 Pressure relief,
It can be used as large water turbine bypass pipe discharge valve. When water turbine has a accident, the main valve is closed, piston type control valve will open automatically to eliminate the harm of the water hammer to the system.

4 Flow control and cut-off
In the fully open to fully closed stroke, the valve flow coefficient and valve opening have linear relationship. Even in the fully closed to 10% opening stroke, still has a good flow control effect. The valve can also cut off the flow channel, play the role of gate valve, globe valve and so on, with good sealing performance.

S.N.	Name	Material	S.N.	Name	Material
1	Front valve body	Ductile iron QT450-12	10	Crankshaft	Stainless steel 2Cr13
2	Fluid director	Stainless steel 316L	11	Shear pin	Stainless steel 316L
3	Back valve body	Ductile iron QT450-12，sealing surface overlaying hard alloy CoCrW	12	Drive shaft	Stainless steel 316L
4	Plunger guide rail	Bronze QSn6.5-0.1	13	Drive bearing	Bronze QSn6.5-0.1
5	Connecting base	Stainless steel 2Cr13	14	End bearing	Bronze QSn6.5-0.1
6	Crankshaft support	Stainless steel 2Cr13	15	Seal ring set	Bronze QSn6.5-0.1
7	Plunger pin	Stainless steel 316L	16	Sealing element	NBR
8	Connecting rod	Stainless steel 2Cr13	17	Fastener	Stainless steel A2-70
9	Plunger	Stainless steel 316L

DN	Boundary Dimension			Connection Size
	Boundary Dimension			PN40				PN63				PN10
	L	B	Hmax	D	D1	n-d	b	D	D1	n-d	b	D	D1	n-d	b
100	325	210	190	235	190	8-23	19	250	200	8-27	30	265	210	8-30	36
125	325	240	230	270	220	8-27	23.5	295	240	8-31	34	315	250	8-33	40
150	350	380	270	300	250	8-27	26	345	280	8-33	36	355	290	12-33	44
200	400	420	390	375	320	12-31	30	415	345	12-37	42	430	360	12-36	52
250	500	490	475	450	385	12-34	34.5	470	400	12-37	46	505	430	12-39	60
300	600	540	550	515	450	16-34	39.5	530	460	16-37	52	585	500	16-42	68
350	700	660	590	580	510	16-37	44	600	525	16-39	56	655	560	16-48	74
400	800	815	620	440	585	16-40	48	670	585	16-43	60	715	620	16-48	82
450	900	965	720	685	610	20-40	49
500	1050	1060	790	755	670	20-43	52
600	1175	1260	875	890	795	20-49	58
700	1320	1350	1040	995	900	24-48	68
800	1480	1515	1270	1140	1030	24-57	76