SUNS SANS Gas Valve Functional Tester

Overview

The SUNS SANS Gas Valve Functional Tester is an engineered instrumentation platform designed for the automated functional verification and performance validation of solenoid valves, pressure-regulating valves, and shut-off valves used in residential, commercial, and industrial gas distribution systems. It operates on a pneumatic test principle: applying precisely regulated supply air (0.4–0.8 MPa) to simulate operational inlet conditions, then measuring dynamic response—including opening/closing time, leak rate, pressure hold stability, and flow continuity—under controlled load conditions. The system integrates real-time pressure transduction, high-resolution volumetric flow sensing (0.001 m³/h), and programmable timing logic to quantify valve actuation latency, sealing integrity, and repeatability across defined pressure ranges (300 Pa to 0.6 MPa). Its architecture supports deterministic pass/fail decision logic per test step, making it suitable for integration into production line final-test stations or QC laboratories performing compliance verification against national and international gas appliance standards.

Key Features

• Programmable timing sequence with 0.1-second resolution and user-defined upper limit up to 999.9 seconds for dwell, open/close delay, and pressure-hold phases
• Dual-mode pressure measurement calibrated to ±0.2 % of full scale, supporting kPa, bar, and psi units with auto-conversion and unit persistence per test profile
• Integrated clean-dry-air supply interface compliant with ISO 8573-1 Class 4 requirements; compatible with external oil-free compressors or centralized plant air networks
• 7-inch resistive touchscreen HMI with intuitive test setup wizard, real-time waveform display (pressure vs. time), and on-screen pass/fail annotation
• Modular I/O subsystem: six opto-isolated digital inputs for external trigger signals (e.g., valve driver status, safety interlock) and six relay outputs for downstream equipment control (e.g., reject gate activation, alarm strobe)
• Robust mechanical design: aluminum alloy chassis, IP20-rated enclosure, and thermal management optimized for continuous operation in ambient temperatures from 5 °C to 45 °C

Sample Compatibility & Compliance

The tester accommodates standard NPT, BSP, and metric-threaded valve interfaces up to DN25 (1 inch), with optional adapter kits available for specialized fittings. It supports single-valve testing by default but enables synchronized multi-station operation via RS-485 daisy-chain or Ethernet TCP/IP command protocol. From a regulatory standpoint, the instrument’s measurement traceability aligns with ISO/IEC 17025 calibration practices when paired with accredited pressure and flow standards. Its test methodology conforms to key clauses in GB/T 27790–2011 (Chinese standard for gas emergency shut-off valves), EN 161:2017 (European standard for automatic shut-off valves), and ANSI Z21.15 / CSA 6.15 (North American gas valve safety requirements). All test logs include timestamp, operator ID, environmental readings, and configuration checksums to support GLP and GMP audit readiness.

Software & Data Management

Embedded firmware supports local data retention of ≥10,000 test records with full metadata: pressure curves, timing events, pass/fail flags, and user annotations. Data export is available via USB mass storage or network transfer using CSV or XML formats. Optional PC-based SANS TestSuite software provides advanced capabilities including statistical process control (SPC) charting, CPK/PPK calculation, batch report generation (PDF/Excel), and role-based access control (RBAC) with password-protected configuration editing. For regulated environments, the system can be configured to meet FDA 21 CFR Part 11 requirements—including electronic signatures, audit trail logging (with immutable timestamps), and user permission hierarchies—when deployed with validated software and documented change control procedures.

Applications

• Final functional testing of domestic gas metering valves and smart gas meters prior to shipment
• Verification of electromagnetic actuator response time and coil resistance consistency in OEM valve manufacturing
• Leak integrity assessment of pilot-operated safety shutoff valves under low-pressure differential conditions (≥300 Pa)
• Validation of pressure decay behavior during extended hold periods (up to 999.9 s) for certification bodies conducting type approval tests
• Process capability studies for Six Sigma initiatives targeting valve assembly yield improvement
• Root cause analysis of field return units through comparative waveform replay and parameter deviation mapping

FAQ

What types of gas valves can be tested with this system?
It is designed for solenoid, diaphragm, piston, and pilot-operated valves used in natural gas, liquefied petroleum gas (LPG), and town gas applications—provided they operate within the specified pressure and flow range and use standard mechanical interfaces.
Is external calibration required, and how often?
Yes. Pressure and flow sensors require periodic recalibration against NIST-traceable standards. SUNS recommends annual calibration or after 2,000 operating hours—whichever occurs first—to maintain stated accuracy specifications.
Can test sequences be customized for proprietary valve logic?
Yes. Using the built-in script editor or SANS TestSuite, users can define multi-step sequences involving conditional branching, variable thresholds, and parallel I/O assertions—without requiring third-party programming tools.
Does the system support remote monitoring over corporate networks?
Yes. Via RJ45 Ethernet, it supports Modbus TCP and custom HTTP API endpoints for live status polling, remote start/stop commands, and real-time data streaming to MES or SCADA platforms.
What safety protections are integrated?
The unit includes over-pressure cutoff at 0.85 MPa, supply-air quality monitoring (via optional dew point sensor input), emergency stop circuit integration, and hardware-enforced interlock logic that halts testing if I/O safety signals are violated.