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What are the possible causes of air leaking from the small hole in the body of an IR series precision regulator when the supply pressure is 0.5 MPa and the set pressure is 0.2 MPa?

This amount should not exceed 4.4 L/min (ANR) for IR1000/2000 series regulators and 11.5 L/min (ANR) for IR3000 series regulators.
For new IR1000-A/2000-A/3000-A series regulators, 1 L/min (ANR) is the max. amount.
Check to confirm whether the leakage is actually bleed air before taking any further steps.

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://smccatalog.partbuilder.smcpneumatics.com/support/faq/en-jp/?ca_id=vacuum-regulators&fa_id=10317

EX124/126, SI Unit For Output

Serial interface unit EX120 controls up to 16 solenoid outputs and is compatible with series SV1000/2000/3000/4000, VQ1000/2000, SX3000/5000 and SY3000/5000 valves. Available protocols include, but are not limited to DeviceNet™, PROFIBUS-DP®, CC-Link, and AS-i.

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://inventory.partbuilder.smcpneumatics.com/vona2/detail/332000133396

EX250, SI Unit, Integrated Type for Input/Output

IP67 enclosure (IP40 for SI unit compatible with ControlNet); Maximum 32 inputs/32 outputs; Connection of sensor with M8/M12 connectors possible; Available communication protocols include: DeviceNet, PROFIBUS DP, CC-Link, AS-i, CANopen and EtherNet/IP; Applicable to valves: VQC1000/2000/4000, S0700 and SV1000/2000/3000

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://inventory.partbuilder.smcpneumatics.com/vona2/detail/332000166213

EX500, Decentralized Serial Wiring, GW System

Serial interface unit EX500 is capable of controlling up to 64 solenoids, and is compatible with SV1000/2000/3000/4000, VQC1000/2000/4000 valves. The EX500 makes it possible to connect up to 4 valve manifolds with up to 16 solenoids each.

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://inventory.partbuilder.smcpneumatics.com/vona2/detail/332000039553

AVA2000-N02GS-Z-A

Body Size: 2000, Port Thread: N (NPT), Port Size: 02 (1/4), Option: GS (Round Type Pressure Gauge, Silencer), Flow Direction, Pressure Unit: Z (Name Plate and Pressure Gauge in Imperial Units)

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://partbuilder.smcpneumatics.com/product-search-results/AVA2000-N02GS-Z-A

NCDA1C150-2000K

Series: NCDA1 (Standard w/ Magnet), Mounting: C (MP4, Single Detachable Rear Clevis), Bore Size: 150 (1 1/2"), Stroke: 2000 (20"), Air Cushion / Rod Boot: K (Neoprene Boot & Both Ends Air Cushion)

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://partbuilder.smcpneumatics.com/product-search-results/NCDA1C150-2000K

NCY2S25L-2000BS

Magnet: None, Bore Size: 25 (1 Inch), Magnetic Holding Force: L (Small Holding Force), Stroke: 2000 (20 Inch), Adjuster: B (Shock Absorber (2 pcs.)), Auto Switch: No Switch, Number: S (1 pc.)

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://partbuilder.smcpneumatics.com/product-search-results/NCY2S25L-2000BS

LEMB32T-2000W-RA

Size: 32, Motor Mounting Position: Top Mounting, Stroke: 2000, Motor Option: w/o Option, Stroke Adjustment Unit: W (Both Sides), Actuator Cable Type: R (Robotic Cable, Flexible), Actuator Cable Length: A (10m)

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://partbuilder.smcpneumatics.com/product-search-results/LEMB32T-2000W-RA

AW30-F02BC

Size: 3/8, Reverse Flow Function: Standard, Thread: G, Port Size: 1/4, Accessory 1: Bracket, Accessory 2: None, Option 1: None, Option 2: C [Bowl Guard (Size 2000 Only)], Option 3: -

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://inventory.partbuilder.smcpneumatics.com/vona2/detail/332000015709/?HissuCode=AW30-F02BC

AW30-F03BC

Size: 3/8, Reverse Flow Function: Standard, Thread: G, Port Size: 3/8, Accessory 1: Bracket, Accessory 2: None, Option 1: None, Option 2: C [Bowl Guard (Size 2000 Only)], Option 3: -

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://inventory.partbuilder.smcpneumatics.com/vona2/detail/332000015709/?HissuCode=AW30-F03BC

AW20-F01BC

Size: 1/8, Reverse Flow Function: Standard, Thread: G, Port Size: 1/8, Accessory 1: Bracket, Accessory 2: None, Option 1: None, Option 2: C [Bowl Guard (Size 2000 Only)], Option 3: -

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://inventory.partbuilder.smcpneumatics.com/vona2/detail/332000015709/?HissuCode=AW20-F01BC

AW40-F06BC

Size: 1/2, Reverse Flow Function: Standard, Thread: G, Port Size: 3/4, Accessory 1: Bracket, Accessory 2: None, Option 1: None, Option 2: C [Bowl Guard (Size 2000 Only)], Option 3: -

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://inventory.partbuilder.smcpneumatics.com/vona2/detail/332000015709/?HissuCode=AW40-F06BC

AW20-F02-C

Size: 1/8, Reverse Flow Function: Standard, Thread: G, Port Size: 1/4, Accessory 1: None, Accessory 2: None, Option 1: None, Option 2: C [Bowl Guard (Size 2000 Only)], Option 3: -

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://inventory.partbuilder.smcpneumatics.com/vona2/detail/332000015709/?HissuCode=AW20-F02-C

AW20-F01-C

Size: 1/8, Reverse Flow Function: Standard, Thread: G, Port Size: 1/8, Accessory 1: None, Accessory 2: None, Option 1: None, Option 2: C [Bowl Guard (Size 2000 Only)], Option 3: -

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://inventory.partbuilder.smcpneumatics.com/vona2/detail/332000015709/?HissuCode=AW20-F01-C

AW20-F01B-C

Size: 1/8, Reverse Flow Function: Standard, Thread: G, Port Size: 1/8, Accessory 1: Bracket, Accessory 2: None, Option 1: None, Option 2: C [Bowl Guard (Size 2000 Only)], Option 3: -

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://inventory.partbuilder.smcpneumatics.com/vona2/detail/332000015709/?HissuCode=AW20-F01B-C

AW20-F02B-C

Size: 1/8, Reverse Flow Function: Standard, Thread: G, Port Size: 1/4, Accessory 1: Bracket, Accessory 2: None, Option 1: None, Option 2: C [Bowl Guard (Size 2000 Only)], Option 3: -

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://inventory.partbuilder.smcpneumatics.com/vona2/detail/332000015709/?HissuCode=AW20-F02B-C

PF3A702H-L

Rated Flow Range: 20 to 2000 l/min, Output Specifications: L [Out: IO-Link, Switch Output (N/P); Func: None; Monitor Unit Model: None], Lead Wire: -, Unit Specification: -, Calibration Certificate: -, Flow Direction: -

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://inventory.partbuilder.smcpneumatics.com/vona2/detail/332000167138/?HissuCode=PF3A702H-L

CKQG-R149S

Types: Gasket, Maintenance part name: Dust Seal Band, Bore size(ø): 100, Compatible air cylinder details: Mechanically Jointed Rodless Cylinder, Basic Type, MY1B Series, Stroke(mm): 2000, Surface Treatment: Black zinc chromate

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://inventory.partbuilder.smcpneumatics.com/vona2/detail/221301815845/?HissuCode=CKQG-R149S

SV2200-5W4U-02

Series: SV2000, Function: 2 Position Double, Pilot: Internal Pilot, Voltage: 24VDC, M12 Waterproof Connector: 2000, Light & Surge Suppressor: Light & Surge Suppressor, Manual Override: Non-locking Push Style, Port Size: 1/4, Thread: -

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://inventory.partbuilder.smcpneumatics.com/vona2/detail/332000027587/?HissuCode=SV2200-5W4U-02

SV2200-5W4R-02N

Series: SV2000, Function: 2 Position Double, Pilot: Internal Pilot, Voltage: 24VDC, M12 Waterproof Connector: 2000, Light & Surge Suppressor: Surge Suppressor, Manual Override: Non-locking Push Style, Port Size: 1/4, Thread: NPT

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://inventory.partbuilder.smcpneumatics.com/vona2/detail/332000027587/?HissuCode=SV2200-5W4R-02N