Ductile Iron Adjustable Pressure Reducing Valve in Steel Plant

• Media: Oil
• Certification: CCC, ISO, CE
• Temperature: Ordinary Temperature
• Connection: Flange
• Valve Seat: Single-Seat
• Structure: Diaphragm
• Material: Cast Iron
• Size: DN15-DN25
• Transport Package: Wooden Case
• Specification: DN15-DN25
• Trademark: HUIZHENG
• Origin: China
• HS Code: 8481804090
• Production Capacity: 3000

Product Description

 Description
Adjustable pressure reducing valve is a kind of pilot operated relief valve, the hydraulic control valve of the main valve and pressure relief valve, the main valve outlet pressure change through enlarge pilot valve to control the main valve disc movement, is a kind of common pressure control valve, the valve is mainly used for water supply pipe network under pressure or building water supply system, keep the downstream pressure for a set value, not due to changes in upstream pressure or downstream of the change of water consumption change. 

02. Main parts&material  

No.	Part	Material	China stardard
1	Body	Ductile iron	EN-JS1040
2	Seat ring	Stainless steel	AISI 304
3	O-ring	Rubber	NBR
4	O-ring	Rubber	NBR
5	Screw bolt	Stainless steel	A2
6	Gasket	Stainless steel	A2
7	Bonnet	Ductile iron	EN-JS1040
8	Axis Guide	Lead Brass	CZ 122
9	Spring	Stainless steel	AISI 304
10	Nut	Stainless steel	A2
11	Diaphragm	Rubber	NBR
12	Diaphragm pressure plate	Ductile iron	EN-JS1040
13	Hinge Pin	Stainless steel	AISI 304
14	Yoke	Ductile iron	EN-JS1040
15	Ball seat	Rubber	NBR
16	Guide plate	Stainless steel	AISI 304
17	Stem	Stainless steel	AISI 304
I8	Plug	Stainless steel	AISI 304

03. Features
001. The stem - diaphragm assembly with dual lead action through top and seat rings provides long life and reliability, 
002. All cast iron parts are coated with powder epoxy resin to resist corrosion. 
003. During maintenance, the main valve can be repaired directly on line without disconnecting from the pipeline. 
004. The linear flow of valve body is convenient to obtain better control characteristics and lower head loss. 
005. Ductile iron has high strength and light weight
006. Reinforced nylon diaphragm, die layer thickness uniform strength, good precision, durable. 
007. Internal use of stainless steel seat, guide platen and shaft, durable. 
008. Good closing effect, safe zero crown leakage. 
009. Hydraulic operation does not need external power, it can be matched with different guide valves and accessories as opening and closing or adjusting water level, pressure and flow. 
010. There is a lifting ring attached above DN150 for lifting operation. 
Feature description: 
001. The pressure reducing valve device is in the system pipeline. When the outlet pressure exceeds the setting system of the wizard valve, the main valve will be automatically closed by the wizard valve, and the main valve will be automatically opened when the pressure is lower than the set value. 
002. The pressure change at the outlet is not changed by the pressure change at the upstream inlet, nor by the water quantity at the downstream outlet. 
003. The final outlet pressure value reaches the equilibrium, that is, the pressure setting value. 

04. Dimensions  

DN	L	ØB	H	D	PN1O	N-Ød PN16	PN25	N. W. Kg
50	230	173	232	85		4-Ø19		14
65	290	197	259	95	4-Ø19	4-Ø19	8-Ø19	19
BO	310	224	279	102	8-Ø19	8-Ø19	8-Ø19	23
100	350	265	305	120	8-Ø19	8-Ø19	8-Ø23	32
150	480	352	445	152	8-Ø23	8-Ø23	8-Ø28	68
200	600	436	569	182	8-Ø23	12-Ø23	12-Ø28	112
250	730	518	611	212	12-Ø23	12-Ø28	12-Ø31	178
300	850	600	659	242	12-Ø23	12-Ø28	16-Ø31	225

 

DN	L	ØD			ØK PN16			H	N-Ød
		PN10	PN16	PN25	PN10	PN16	PN25		PN10	PN16	PN25
400	1100	565	580	620	515	525	550	813	16-Ø28	16-Ø31	16-Ø37
450	1100	615	640	670	565	585	600	813	20-Ø28	20-Ø31	20-Ø37
5CO	1250	670	715	730	620	650	660	967	20-Ø28	20-Ø34	20-Ø37
6CO	1450	780	840	845	725	770	770	1140	20-Ø31	20-Ø37	20-Ø40
700	1450	895	910	I 960	840	840	875	1140	24-Ø31	24-Ø37	24-Ø43

05. Execution standard  

Design standard	CJ/T219, JB/T10674
Flange connection standard	GB/T17241.6
Structural length standard	GB/T12465
Inspection testing standard	GB/T13927
Face spacing standard	GB/T12221

06. Technical parameters  

Nominal diameter	DN50~DN600(2"~24") PN10 DN50~DN600(2"~24") PN16 DN50~DN200(2"~8") PN25
Nominal pressure	PN10/PN16/PN25
Operating temperature	0°C~85°C
Seal test	1.1PN
Shell test	1.5PN
Suitable medium	Water

07. Operating principle
Relief pilot valve's work is based on the spring down on began and the force of the disc and close the disc forces on diaphragm upward on the basis of mutual balance, when the main valve back-end water, pilot valve spring pressure is greater than the effect on water pressure of the bottom of pilot valve diaphragm, pilot valve began to qi, the main valve cavity drainage outward, the main valve to play me alone, when the main valve back-end without water, the back-end pressure increases, the pilot valve diaphragm upward push, to close the pilot valve, which makes the main valve closed, the back-end pressure stable in a fixed value, and the main valve back-end water is different, make the effects on different water pressure of the bottom of pilot valve diaphragm, pilot valve began to change, Thus, the size of the main valve opening can be controlled to keep the pressure at the back end at the set value. The pressure set at the back of the valve can be adjusted by the adjusting screw on the pressure relief guide valve. 

08. Applications
Widely used in petrochemical, chemical, gas, natural gas, liquefied petroleum gas, HVAC and general industry.