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-、preface                          

Multifunctional axial flow control valve, also known as piston valve, is a new product of Zui developed by our company on the basis of absorbing foreign technology. It has many functions, such as flow control, decompression and pressure stabilization control, pressure relief and pressure holding control, venting and energy dissipation. The valve has the advantages of novel structure, advanced performance, reliable operation and wide application

It can be used in various water supply and drainage systems of water conservancy and hydropower, metallurgy, petrochemical, water department, municipal administration, environmental protection and other industries, as well as oil and gas medium systems. (hereinafter referred to as control valve)

1、 Decompression / stabilization: the pressure reduction range is large, and the single-stage valve can be reduced from 10 Ma to 0.1 ma. And the valve operation without noise, cavitation. In the systems of high-pressure artesian water supply, high-pressure head hydropower station, deep mine, etc., water is taken from the pressure pipe, and the water can be supplied to the low-pressure manual system after one-stage decompression of the valve。

2、 Pressure relief / pressure holding: through upstream pressure sensing control and automatic valve opening and closing by electric device, the flow and pressure can be adjusted in a wide range, which can be used as the bypass discharge valve of large pump station and hydro generator unit. It also has no noise and cavitation performance.

3、 Flow control and cut-off: during the stroke from full open to full close, the valve flow system has a linear relationship with the valve opening. Even in the stroke from full close to 10% opening, it still has good flow regulation performance. Accurate flow regulation can be realized through downstream flowmeter or manual control. At the same time, the valve has cut-off function and excellent sealing effect。

4、 Venting and energy dissipation: the valve can be directly installed with the port of high-pressure pipe network as an energy dissipation and discharge valve. When water flows through the valve, it collides with each other and diffuses and ejects at a wide cone angle. It decomposes and dilutes through the impedance of the air, so as to dissipate the impact capacity and protect the downstream facilities. The beam hood can be added to effectively control the jet direction。

The sleeve is placed on the inner cavity of the valve body and guided by the guide rail. The water flows from the outside of the guide device and forms multiple streams of water through the jet hole on the deflector, which produces collision in the middle chamber of the valve body to achieve the effect of energy dissipation. The throttling occurs between the sleeve edge and the orifice of the deflector. Due to the high flow velocity in the hole, the material selected for the deflector is highly wear-resistant and corrosion-resistant. At the same time, due to the collision, the middle chamber of the valve channel is effectively reduced The influence of cavitation and erosion on valve body can improve the service life of valve. The main seal ring is located at the front end of Zui of the deflector, and the sleeve is guided in the full stroke. When it is pushed through the main seal ring to the fully closed position, the differential pressure between the front and rear of the valve forces the main seal ring to be close to the outer wall of the sleeve to realize the truncation. The sleeve moves back and forth in the cavity of the valve body through the guide of the connecting rod, and the valve rod is driven by the crank and connecting rod. When the actuator drives the valve stem to rotate against the clock, the sleeve moves backward to open the valve; when the actuator drives the valve stem to rotate clockwise, the sleeve moves forward to close the valve。

                     Fig. 4 Schematic diagram of valve energy dissipation

technical parameter（1MPa=10kgf/cm2)

project	parameter
Nominal pressure(MPa)	0.6-6.3MPa
Leakage	accord withGB/T13927Standard regulations
Applicable temperature(℃)	-29~120℃
Applicable media	Water, air, natural gas, gas, etc

Parameter summary table of multi function axial flow control valve

Serial number item	parameter			remarks
One	Valve name	control valve		Can be equipped with control box (decompression / relief / flow regulation)
Two	Nominal pressure	PN
Three		1.5PN
Four	Sealing test pressure	1.1PN
7	Set pressure (H / relief condition)	Nominal pressure	Adjustment range	It can be set according to the working conditions
			0.05-0.9 MPa
		1.6 MPa	0.05-1.4 MPa
		2.5 MPa	0.05 -2.3 MPa
		4.0 MPa	01-3.8 MPa
		6.3 MPa	0.1-6.0 MPa

  

Multi function axial flow control valve is composed of valve body, stem, crank and sleeve. The deflector made of stainless steel is fixed in the middle chamber of the valve body. The deflector has guide groove type, guide vane type and spray hole type. The sleeve looper is in the valve body cavity and connected with the valve stem. The position of the sleeve is controlled by the external control parts to adjust the flow area of the valve. The external control components can be manual, electric, pneumatic and hydraulic according to the working conditions.

Fig. 2 guide vane type
The multi-functional axial flow control valve has the following four main forms, and its structure and application range are as follows:

1、Plunger type structure can be widely used in water, oil and gas systems, with simple structure, reliable operation, small head loss, and low requirements for medium cleanliness, which is the common form of Zui.

2、 Guide vane type is suitable for large pressure difference, gas-liquid mixing and other working conditions, stable operation and low cavitation.

3、 The structure of diversion groove has superior regulation performance, which can be used in high pressure differential system and working conditions with suspended particles and other impurities, and has good cavitation resistance.

4、The results show that the spray hole structure has good adjustability and the effect of flow regulation and pressure reduction for clean media under ultra-high pressure difference condition is excellent. 

Fig. 1 valve structure diagram

Serial number	name	Material Science		Serial number	name	Material Science
1	valve body	Ductile ironQT450-10 /Cast steel WCB / stainless steel		10	rings	35#
2	crank	Stainless copper 2Crl3		11	Plug
3	Drive shaft	Stainless steel 2Crl3		12	Executive Agency	Handwheel / intelligent electric installation
4		connecting rod	Stainless steel 2Crl3	13		Stainless steel 2Crl3
5	Sleeve	Stainless steel 304 / 316		14	Sealing element	Butadiene rubber
6	Sleeve gland	Stainless steel 2Crl3		15	Sleeve guide	Aluminum bronze zcuall0fe3
7	a fastening	Stainless steel A2-70		16	Ink seal	Butadiene rubber
8	Crankshaft support	Stainless steel 2Crl3		17	Drive pin shaft
9	Drive bearing

Axial symmetrical flow passage: the valve body adopts axial symmetrical flow passage, and the medium flows into the valve through streamline inner cavity. The shape of flow passage at any position in the valve is circular. Compared with the traditional valve, the flow channel of sleeve valve is smooth, and the fluid has no sharp turning under any opening, which avoids unnecessary change of flow direction, significantly reduces noise and turbulence trend, and reduces valve cavitation.

Pressure balance: because the multi-functional axial flow control valve adopts pressure balance sleeve, the axial force of operating sleeve has nothing to do with the pressure difference at both ends of the valve, so the purpose of quick action can be achieved by using smaller actuator (the opening and closing torque is only 1 / 3-1 / 5 of that of ordinary gate valve, butterfly valve and other transmission valves).

Good regulation effect: almost digital control, through changing the number of flow holes to achieve the change of flow area, with good linear regulation characteristics.

1、The pressure sensor outputs 4-20mA DC signal to calibrate the small pressure value of Zui and the large pressure value of Zui.

2、The output feedback signal of pressure sensor is sent to PLC for processing. After comparing the preset values of PLC, the corresponding control signal is output to the electric actuator, and the valve is driven to the corresponding position (valve opening).

3、 PLC is responsible for opening reservation, feedback signal comparison and control; output work, the electric actuator is responsible for driving the valve to the specified position according to the PLC command, the control precision is set by PLC, this method is closed-loop control, stable and reliable.

4、The electric actuator adopts intelligent type, which has many functions such as stroke protection, torque protection, phase failure alarm, etc.

Dimension and connection dimension table of pn1.0-pn2.5mpa multifunctional axial flow control valve

nominal Diameter	Overall dimension (standard value)				Connection size (standard value)
					PN1.0 MPa				PN1.6 MPa				PN2.5 MPa
	L	B	H	H1	D	D1	n-Фd	b	D	D1	n-Фd	b	D	D1	n-Фd	b
100	325	210	160	80	220	180	8-Ф18	22	220	180	8-Ф18	22	235	190	8-Ф22	24
125	325	240	190	100	250	210	8-Ф18	22	250	210	8-Ф18	22	270	220	8-Ф26	26
150	350	290	220	150	285	240	8-Ф22	24	285	240	8-Ф22	24	300	250	8-Ф26	28
200	400	330	310	190	340	295	8-Ф22	24	340	295	12-Ф22	24	360	310	12-Ф26	30
250	500	330	395	230	395	350	12-Ф22	26	405	355	12-Ф26	26	425	370	12-Ф30	32
300	600	420	460	260	445	400	12-Ф22	26	460	410	12-Ф26	28	485	430	16-Ф30	34
350	700	510	490	300	505	460	16-Ф22	26	520	470	16-Ф26	30	555	490	16-Ф33	38
400	800	655	520	335	565	515	16-Ф26	26	580	525	16-Ф30	32	620	550	16-Ф36	40
450	900	750	580	345	615	565	20-Ф26	28	640	585	20-Ф30	40	670	600	20-Ф36	46
500	1050	820	640	385	670	620	20-Ф26	28	715	650	20-Ф33	44	730	660	20-Ф36	48
600	1175	970	730	460	780	725	20-Ф30	34	840	770	20-Ф36	54	845	770	20-Ф39	58
700	1320	1050	850	500	895	840	24-Ф30	34	910	840	24-Ф36	40	960	875	24-Ф42	50
800	1480	1215	1020	600	1015	950	24-Ф33	36	1025	950	24-Ф39	42	1085	990	24-Ф48	54
900	1700	1350	1270	700	1115	1050	28-Ф33	38	1125	1050	28-Ф39	44	1185	1090	28-Ф48	58
1000	1900	1560	1390	800	1230	1160	28-Ф33	38	1255	1170	28-Ф42	46	1320	1210	28-Ф55	62
1200	2100	1750	1510	900	1455	1380	32-Ф39	44	1485	1390	32-Ф48	52	1530	1420	32-Ф55	70
1400	2420	2100	1625	1000	1675	1590	36-Ф42	48	1685	1590	36-Ф48	58	1755	1640	36-Ф60	76
1600	2700	2435	1920	1200	1915	1820	40-Ф48	52	1930	1820	40-Ф55	64	1975	1860	40-Ф60	84
1800	3070	2670	2110	1400	2115	2020	44-Ф48	56	2130	2020	44-Ф55	68
2000	3250	1980	2310	1600	2325	2230	48-Ф48	60	2345	2230	48-Ф60	70