Self-Operated Pressure Regulator DN20-300 for Efficient Fluid Control with Carbon Steel Materials

• Customization: Available
• Temperature: Ordinary Temperature
• Certification: GS, CE, ISO9001
• Model NO.: AOC-3112
• Media: Gas, Oil, Water, Acid
• Standard: Standard
• Connection Mode: Flange
• Power: Pneumatic
• Material: Stainless Steel
• Type: Self-Operated
• Nominal Diameter(DN): 20-300
• Length of The Receiver Tube (B): 383-2200
• Flange Face Distance L(Pn16/25/40): 150-850
• Flange Face Distance L(Pn64): 230-900
• Pn16 Weight as an Example: 26-675
• Flow Character: Quick-Open
• Body Mat.: A216wcb
• Seat Mat.: 316ss+Stl
• Stem Mat.: 316ss+Solution Treatment
• Packing: PTFE
• Bonnet Type: Bellows
• Effective Area: 1000 Cm2
• Temperature Range: -20 Degree~250 Degree
• Allowable Leakage: Class IV (Hard Seal)/Class VI (Soft Seal)
• Flange Standard: GB/T9113-2000/Jb/T79.1-94/Jb/T79.2-94/ Hg2059
• Transport Package: Wooden
• Trademark: SNT
• Origin: China
• HS Code: 8481804090
• Production Capacity: 500000PCS/Year

Product Description

Product Description

^{Introducing the AOC-3112 Model Self-Operated Pressure Regulator Valve with Pilot, a state-of-the-art solution for efficient fluid control. This innovative Pressure Valve functions without the need for any external energy source, harnessing the energy of the regulated medium itself as a power source. By ingeniously incorporating the pilot of the Pressure Valve, it meticulously controls the valve core's position, thereby flawlessly adjusting the medium's flow rate. This ensures unerring pressure stability, be it constant downstream pressure (Type B) or unwavering upstream pressure (Type K). Type B shines in scenarios where the upstream pressure is notably high (0.2-0.8 MPa) and the downstream pressure is critically low (0.5-100 KPa), such as in delicate cases of 50 mmH2O (water column). Meanwhile, Type K is expertly tailored for nitrogen purging systems and is seamlessly compatible with nitrogen supply systems.}

Structure Features

<sup>1. Our pressure setting system is a marvel of convenience and efficiency, accomplished directly on the pilot, making adjustments both swift and effortless. This feature saves labor and time, offering the capability of seamless adjustments even during operation. With exceptional control accuracy, it is perfectly suited for applications demanding high precision control.
2. The adjustment range for this valve surpasses that of ordinary self-operated valves, providing unparalleled flexibility for diverse applications.
3. Our valve is remarkably sensitive, with the ability to detect even the slightest pressures, such as a pressure of merely 50 mm H2O, or the most minute pressure changes.
4. The valve boasts an extraordinary pressure reduction ratio. For instance, with an upstream pressure at 0.8 MPa and a downstream pressure of 50 mm H2O, the pressure differential ratio impressively reaches 1600.

For specialized applications involving other products such as the self-operated micro-pressure regulator valve, differential pressure regulator valve, temperature regulator valve, flow regulator valve, or liquid level regulator valve, we encourage you to reach out to the expert team at the SNT Technical Department.</sup>

Product Parameters

Nominal diameter(DN)			20	25		32	40	50		65	80		100	125	150	200			250	300
Length of the receiver tube (B)			383			512		603		862			1023	1380		1800			2000	2200
Flange face distance L(PN16,25,40)			150	160		180	200	230		290	310		350	400	480	600			730	850
Flange face distance L(PN64)			230			260		300		340	380		430	500	550	650			775	900
Pressure adjustment range KPa	15~140	H	475			520		540		710			780	840		880			940	950
		A	280			308
	120~300	H	455			500		520		690			760	800		870			900	950
		A	230
	280~500	H	450			490		510		680			750	790		860			890	940
		A	176							194			280
	480~1000	H	445			480				670	740		780	780		850			880	930
		A	176							194				280
PN16 Weight (Kg) PN16 as an example			26		37				42	72		90	112	130	169		285	495		675

 

Product Materials

Part name	Materials
Valve body	A216 WCB,A351 CF8/CF3/CF8M/CF3M,ZG230-450,ZG0Cr18Ni9Ti,ZG0Cr18Ni12Mo2Ti
Spool	304SS,316SS,304LSS,316LSS,1Cr18Ni9,  0Cr18Ni12Mo2Ti (Stellite Clad welding Stellite)   PTFE
Valve seat	304SS,316SS,304LSS,316LSS,1Cr18Ni9,0Cr18Ni12Mo2Ti (Stellite Clad welding Stellite)
Stem	304SS,316SS,304LSS,316LSS,1Cr18Ni9,1Cr18Ni9,0Cr18Ni12Mo2Ti
Rubber diaphragm	Nitrile,ethylene,fluoro,oil resistant rubber ,0Cr18Ni9Ti
Membrane cover	Q235,Q235 Painting PTFE
Packing	Polytetrafluoroethylene,flexible graphite

Pressure adjustment method

^{Our cutting-edge self-regulating pressure valve comes factory-adjusted to your specified set value. However, should you wish to modify this set value, or if the actual indication deviates from your desired set value, effortless adjustments can be made. The pressure can be decreased by turning the adjusting bar with the turning piece 7 (adjusting disc) in a clockwise direction, while increasing the pressure is as simple as turning it counterclockwise.}

Valve Maintenance

Trouble shooting	Causes of production	Exclusion methods
Unstable post-valve pressure with	1,Spool stuck by foreign objects 2,Valve stem, push rod jammed 3,Fluid inlet pipe blocked	1,Reinstallation to exclude foreign objects 2,Re-adjustment 3,unclogging
,pressure changes in front of the valve	1,Set spring stiffness is too large 2,The valve bore is too large 3,The pressure before the valve is too high, the pressure reduction ratio is too large	1,Replacement of springs 2,Replace the smaller diameter 3,The pressure before the valve and the pressure after the valve exceed 20, should be 2 levels of pressure reduction
Pressure behind the valve does not drop, always above the demand value	1,Set spring stiffness is too small 2,The valve bore is too small 3,The pressure reduction ratio is too small	1,Replacement of springs 2,Replace the larger diameter 3,Pressure before the valve: the pressure after the valve is lower than 1.25, the pressure before the valve should be increased
Pressure behind the valve does not rise, always below the demand value	1. Set spring stiffness is too small 2,The spool is stuck by a foreign object 3,Valve stem, push rod jammed 4,The spool and seat are damaged, the leakage is too large 5,The valve bore is too large	1,Replacement of springs 2,Reinstallation 3,Re-adjustment 4,Re-grind, or replace 5,Replace smaller diameter
Pressure behind the valve does not rise and always moves below the demand value	1 Set spring stiffness is too large 2,The valve bore is too small 3,The spool, stem, push rod, etc. are stuck	1,Replacement of springs 2,Replace larger diameter 3,Exclude the cause of jamming and readjust
Pre-valve pressure does not drop, always moves above the demand value	1,The valve bore is too large 2,Actuator membrane chamber capacity is too small	1 Select the proper valve diameter 2,Add a damper in the inlet pipeline

 

Instructions for Ordering

^Valve type		^Valve name
^Nominal diameter (mm)	√	^Nominal pressure (Mpa)	√
^Pressure adjustment range (Mpa)		^Control valve before or after	√
^Pressure setting value (Mpa)	√	^Name of medium	√
^Actuator type		^Medium working temperature	√
^Rated flow coefficient		^Medium state	√
^Max. pressure before valveMinimum pressure before valveNormal pressure before the valve(Mpa)	√	^Max. pressure after valveMin. pressure after valveNormal pressure after valve (Mpa)	√
^Maximum flow rateMinimum flow rateNormal flow rate		^Viscosity of liquidsLiquid densityGas density
^Material:Valve bodyValve internals		^Leakage level requirements(GB/T4213-92)
^Process piping dimensions	√	^Corrosion resistance requirements
^Flange face distance (mm) L		^Flange execution standards
^Supplied with accessories	^Condenser, receiver, mating flange, fasteners, regulator bar, pressure take-off tube, pressure take-off fitting

 

Production application

 

 

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