Audited Supplier
AOC-3112
Ordinary Temperature
GS, CE, ISO9001
Gas, Oil, Water, Acid
Standard
Flange
Pneumatic
Stainless Steel
Self-Operated
20-300
383-2200
150-850
230-900
26-675
Quick-Open
A216wcb
316ss+Stl
316ss+Solution Treatment
PTFE
Bellows
1000 Cm2
-20 Degree~250 Degree
Class IV (Hard Seal)/Class VI (Soft Seal)
GB/T9113-2000/Jb/T79.1-94/Jb/T79.2-94/ Hg2059
SNT
Wooden
China
8481804090
Product Description
The AOC-3112 Model Self-Operated Pressure Regulator Valve with Pilot (hereinafter referred to as the Pressure Valve) does not require an external energy source. It utilizes the energy of the regulated medium as the power source, introducing the pilot of the Pressure Valve to control the position of the valve core, thereby adjusting the flow rate of the medium through the valve. This ensures that the downstream pressure (Type B) or upstream pressure (Type K) remains constant. Type B is primarily used when the upstream pressure is relatively high (0.2-0.8 MPa) and the downstream pressure is very low (0.5-100 KPa), such as in cases of 50 mmH2O (water column). Type K is used exclusively in nitrogen purging systems and is compatible with nitrogen supply systems.
1. The pressure setting is accomplished on the pilot, making it convenient, quick, labor-saving, and time-efficient, with the capability of continuous adjustment during operation. It boasts high control accuracy, making it suitable for applications requiring high precision control.
2. For the same valve, the adjustment range is broader compared to an ordinary self-operated valve.
3. It is particularly sensitive, capable of detecting very small pressures (such as a pressure of 50 mm H2O) or minimal pressure changes.
4. The pressure reduction ratio is exceptionally large; for example, with an upstream pressure of 0.8 MPa and a downstream pressure of 50 mm H2O, the pressure differential ratio reaches 1600.
For applications of other products (self-operated micro-pressure regulator valve, self-operated differential pressure regulator valve, self-operated temperature regulator valve, self-operated flow regulator valve, self-operated liquid level regulator valve), please contact the SNT Technical Department.
| 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 | |||||||||
| 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 |
The self-regulating pressure valve is factory adjusted to the set value, but if the user wants to change the set value, or if for some reason the actual indication value deviates from the set value, the pressure can be lowered by turning the adjusting bar with the turning piece 7 (adjusting disc) in the clockwise direction and the pressure increased by turning it in the counterclockwise direction.
| 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 valve Minimum pressure before valve Normal pressure before the valve(Mpa) | √ | Max. pressure after valve Min. pressure after valve Normal pressure after valve (Mpa) | √ |
| Maximum flow rate Minimum flow rate Normal flow rate | Viscosity of liquids Liquid density Gas density | ||
| Material:Valve body Valve 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 | ||
