3/4" Low Pressure Gas Solenoid Valve - N/O
Availability: In Stock
Technical Details
SKU
BCM-20K
Position
Normally Open
Port Size
3/4" Female NPT
Available Voltage
Select Above
Body Material
Brass
Components
Stainless Steel
Seal Material
NBR Diaphragm
Orifice Size
20 mm
Temp Range
15 to 140°F / -10 to 60°C
Pressure Range
0 - 60 PSI (No Minimum Pressure)
Flow Rate
Cv 7.5 (Appx 58 GPM @ 60 PSI)
Power
AC: 20VA / DC: 20 Watts
Coil Connection
DIN 43650A
Coil Class
Class H (356°F )
Response Time
Fast Acting (Less than one second)
Duty Cycle
100% Duty at Rated Ambient Temperature
*Suitable Media
Natural Gas, Propane, Inert Gases
Weight
1 lbs.
Height
4.84"
Length
2.87" port to port
Width
2.20"
CAD Files
Available Upon Request
Product Overview
The BCM-20K is a high-capacity 3/4" brass solenoid valve engineered for reliable performance in zero- and low-pressure gas applications. Built with an internal high-tension spring and a durable NBR diaphragm, this valve guarantees a positive, airtight seal at 0 PSI where standard pilot-operated solenoid valves fail to function.
Important Application Notice:
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- This valve is Normally Open (remains open when de-energized and closes when powered). It is not suitable for primary fuel-gas safety shutoff, as power loss will allow gas to flow. This configuration is specifically intended for specialized systems such as double-block-and-bleed vent lines, high-volume purge systems, and atmospheric relief manifolds.
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Key Features
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Zero Differential Sealing: Direct-assist mechanical spring ensures tight closure under minimal or zero line pressure.
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Normally Open Configuration: Maintains an open flow path during power outages for reliable emergency venting.
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Heavy-Duty Construction: Forged brass body with stainless steel internal components and nitrile (NBR) seals optimized for natural gas, propane, and inert gases.
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High Flow Capacity: 3/4" female NPT ports provide maximum flow for larger commercial burner trains and industrial vent lines.
Common Applications
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Atmospheric vent/bleed lines in NFPA/CSD-1 compliant double-block-and-bleed gas trains
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High-volume low-pressure natural gas and propane ventilation loops
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Industrial kiln, furnace, and thermal oxidizer relief systems
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Inert gas blanketing (Nitrogen, Argon) and distribution manifolds
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Process equipment purge and exhaust systems
Installation Note
This valve is directional. Align gas flow with the directional arrow marked on the valve body. Backpressure or flow reversal will prevent the diaphragm from sealing correctly. Always verify gas compatibility, operating pressure, and applicable municipal or industry safety codes before installation.
Wiring Instructions:
- Loosen and remove the Phillips-head screw securing the DIN connector to the coil.
- Detach the DIN connector from the coil.
- Open the DIN connector housing by prying at the small slot located in the bottom corner next to the Earth terminal.
- Inside the housing, locate the screw terminals:
- Terminal 1: Connect the hot or positive wire.
- Terminal 2: Connect the neutral or negative wire.
- Earth Terminal (for AC voltages only): Connect the ground or Earth wire.
- Ensure all screw terminals are securely tightened for a reliable connection.
- Reassemble the DIN connector by reversing the steps above.
