This normally open flanged solenoid valve is constructed from grade 304 stainless steel, delivering robust corrosion resistance for compatibility with diverse process media. As a normally open configuration, the valve maintains an unobstructed flow path under de-energized conditions. It shuts off fluid passage upon power activation and reverts to its open state automatically once power is lost. This NO-type solenoid valve represents an industrial fluid control component balancing operational safety and broad application adaptability.

Parameters

Valve body material	SS304
Applicable media	Oil,Gas,Water
Connection	Flange
Power	Electric/Pneumatic
Applicable temperature	Normal temperature
Warranty period	12 months
Support customization	OEM,OBM,ODM

Advantages

Highlighted fail-safe logic

It reinstates fluid passage autonomously once power supply fails. The design fits installations that demand sustained fluid circulation amid malfunctions or emergency events, bolstering operational safety under specialized working regimes.

Energy efficiency adapts to long-flow requirements

Power input is required solely for valve closure. For continuous baseline fluid conveyance, this configuration achieves superior energy efficiency relative to normally-closed alternatives.

304 Stainless Steel Valve Body

It boasts anti-corrosion and heat-resistant properties, compatible with an array of working media including water, mild acidic or alkaline solutions, and gaseous fluids.

Flange Connection

The unit supports straightforward mounting and teardown, paired with dependable sealing integrity. It accommodates high-pressure, high-volume flow regimes within industrial piping networks.

Flexible control logic

It achieves rapid fluid isolation upon energization, featuring a swift actuation response with a typical lag of ≤1 second. This characteristic suits automated control setups that demand intermittent flow termination.

Application Scenarios

Fire suppression installations: If power is lost amid a fire incident, the valves actuate to an open state, securing unimpeded passage for fire water or extinguishing media.

Emergency pressure relief and venting piping: When equipment malfunction or power outage arises, valve opening releases excess pressure and safeguards assets against overpressure-induced damage.

Ventilation and exhaust infrastructure: It sustains baseline air circulation under regular operating states; power supply is activated only on demand, such as for temporary closure of workshop exhaust streams.

Intermittent material feeding and transfer: Continuous fluid conveyance is required for most of the operational cycle, with brief energization solely to trigger shutoff, for instance, terminal regulation for batch filling operations.

Safety guarding piping networks: Including emergency gas discharge lines and chemical equipment safety return circuits, where uninhibited flow must persist during power outages.

Routine maintenance

01.

Visual Inspection

Examine the valve body and electromagnetic coil for corrosion and physical defects. Verify the firmness of electrical terminal connections and assess flange joints for fluid seepage.

02.

Action Test

While de-energized, verify the valve rests at its open position. Apply power to trigger the closing stroke and log the actuation latency. Carry out immediate examination should any irregularities emerge.

03.

Cleaning and Maintenance

Wipe down the valve body and coil using a dry rag. Where the working medium carries particulate contaminants, perform scheduled teardown of the valve bonnet at set intervals (such as every 3 months) to cleanse the spool and sealing components. Take care not to scratch the sealing contact faces.

04.

Insulation Check

Deploy a multimeter to gauge the coil's insulation resistance, which must register at or above 5MΩ. This check mitigates the risk of coil short circuits triggered by moisture ingress.

Certifications

ISO accreditation serves as far more than a mere entry-level credential for our enterprise. It acts as an all-round embodiment of our manufacturing quality, regulatory adherence and market competitiveness, propelling our transition from basic low-value fabrication toward sophisticated standardized production.

Production Process

1. Valve Body Machining

Casting & Forging Stage: 304 stainless steel stock is cast or forged to form rough blanks for valve bodies and bonnets, followed by deburring and flash removal. Precision Machining Stage: Lathes and milling equipment process internal flow passages, sealing faces and flange bolt holes to maintain strict dimensional tolerances (such as DN80 interface precision). The sealing contact surfaces are finished via polishing to mitigate fluid leakage.

2. Valve Core Assembly (Critical for Normally Open Types)

Valve Core Fabrication: The 304 stainless steel spool undergoes machining work, followed by fitting of sealing inserts such as O-rings to achieve a tight mating seal against the valve seat. Spring Calibration: A purpose-built return spring for normally-open operation is mounted. Its spring tension must satisfy the design criterion: it pushes the spool to an open state under de-energized conditions, while the electromagnetic force from the coil overcomes this tension once energized. Preload tuning of the spring guarantees stable spool opening upon power loss.

3. Valve Body Assembly

Component Integration: Mount the spool assembly, valve bonnet, flange gasket and other hardware onto the valve body sequentially. Fasten bolts with regulated torque values to avert distortion of sealing contact faces. Coil Fitting: Couple the solenoid coil to the valve stem. Confirm the coil can generate sufficient magnetic pull upon energization to actuate the spool and complete the shutoff stroke.

4. Performance Testing (Special Test for Normally Open Type)

Cycle Actuation Assessment: Supply the designated voltage to validate the valve's operating sequence of energized closure and de-energized reopening. Run 10–20 repeated cycles to verify dependable automatic reset. Sealing Evaluation: De-energized open condition: Feed fluid at rated pressure and examine for seepage at valve seats and flange joints. Energized closed condition: Sustain pressure and inspect leakage across the spool sealing interface, which must satisfy industrial benchmarks (≤0.1mL/min). Hydrostatic Pressure Endurance Test: Exert pressure equivalent to 1.5 times the nominal rating (e.g., 2.4MPa) and hold this load for 5 minutes. Confirm the valve body exhibits no structural distortion or fluid escape.

5. Surface Treatment and Packaging

Surface Treatment: The valve body is passivated (304 stainless steel for corrosion resistance) and marked with parameters such as DN80, 16MPa, and NO (normally open).
Packaging and Warehousing: Protective covers are added (to prevent impurities from entering the interface), a certificate of conformity is affixed (indicating model, batch number, and test results), and the valve is packed and stored.

Company Profile

SND is a leading valve manufacturer specializing in high-performance hydraulic control valves and innovative flow solutions. Leveraging international patents and technological collaborations, we strictly adhere to the ISO 9001 quality management system, ensuring zero defects in our products and earning recognition as an industry benchmark.

Our advanced automated manufacturing processes and integrated network management ensure product reliability and have been approved by China's construction authorities. With a nationwide sales and service network, we are committed to continuous innovation, developing next-generation valve technologies and providing globally leading, reliable, and efficient flow control solutions.