Jul . 20, 2025 23:01 Back to list

SSDJ-FZ-F/C-RQZ Automatic Gas Cut-off Valve - Reliable Safety Shutdown

HEBEI OUYINUO GAS EQUIPMENT CO.,LTD.

Global innovator of pipeline safety equipment since 2006, serving over 120 countries with certified industrial valve solutions

Phone: +86-318-8289999
Mobile: +86-400-663-8811
Email: hboynrq@163.com
Address: No. 6 Weiqi Street, South District of Hengshui Innovation Port, Zaoqiang County, China

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SSDJ-FZ-F/C-RQZ Automatic Gas Cut-off Valve - Reliable Safety Shutdown

SSDJ-FZ-*F/C-RQZ Valve Overview

The SSDJ-FZ-*F/C-RQZ gas safety shut-off valve represents a critical component in modern gas transmission and distribution systems. Designed with advanced pressure monitoring capabilities, this valve automatically activates upon detection of dangerous pressure fluctuations - including overpressure scenarios exceeding operational limits or sudden pressure loss events. Using a spring-loaded cutoff mechanism that requires manual reset after activation, it ensures failsafe operation in both industrial plants and pipeline infrastructures. The series includes multiple configurations adaptable to pipeline diameters ranging from 1" to 12", with pressure monitoring ranges adjustable from 0.5kPa to 100kPa. Constructed from ASTM A351 CF8M stainless steel bodies with NBR diaphragm seals, these valves provide superior corrosion resistance in demanding gas environments.

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Pressure Monitoring

Continuous monitoring for overpressure and pressure loss events with ±1% accuracy

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Manual Reset

Requires deliberate operator intervention to ensure system integrity after cutoff events

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Robust Construction

316L stainless steel bodies withstand pressures up to 16 bar with temperature resistance from -20°C to +80°C

Industry Trends & Technological Evolution

The global gas safety equipment market is projected to grow at 7.2% CAGR through 2030 (Global Gas Safety Association, 2023). This growth is driven by increased natural gas consumption, stringent safety regulations like EN 13611:2019 for automatic shut-off devices, and pipeline infrastructure expansions across developing economies. Modern cut-off valves increasingly incorporate digital monitoring capabilities - a technological frontier where the SSDJ-FZ-*F/C-RQZ platform provides versatile retrofitting options through its modular sensing compartment.

"Modern gas networks require intelligent shutdown solutions that integrate mechanical reliability with digital monitoring capabilities. The industry shift toward smart monitoring presents manufacturers with both engineering challenges and opportunities for innovation."
- Dr. Chen Wei, Pipeline Safety Monthly Journal

Technical Specifications & Performance Data

Parameter	Standard	Premium	High-Performance	Testing Standard
Nominal Diameter (DN)	25mm - 100mm	100mm - 200mm	200mm - 300mm	EN 161:2023
Max Operating Pressure	5 bar	10 bar	16 bar	ISO 5208:2022
Set Pressure Accuracy	±2%	±1.5%	±1%	DIN 3381:2019
Temperature Range	-15°C to +70°C	-20°C to +80°C	-30°C to +100°C	ISO 6978:2022
Seal Material	NBR	HNBR	Viton	EN 549:2022
Actuation Time	≤3 seconds	≤2 seconds	≤1.5 seconds	ISO 23553-1:2021

Fig. 1: Pressure Tolerance Across Valve Series

Fig. 2: Temperature Performance Comparison

Industrial Applications & Use Cases

The SSDJ-FZ-*F/C-RQZ gas safety shut-off valve provides critical protection in these environments:

Natural Gas Distribution Networks

City gate stations utilize these valves to isolate pipeline segments during pressure surge events, preventing widespread shutdowns. Overpressure protection at 1.15x normal operating pressure prevents cascade failures.
Industrial Manufacturing Plants

Furnace feed lines incorporate F/C-RQZ valves to prevent backflow incidents and downstream pressure losses. The manual reset function ensures deliberate safety verification before restarting operations.
LNG Terminal Safety Systems

Emergency shutdown systems combine these valves with gas detectors for comprehensive hazard management. Cryogenic-resistant variants maintain seal integrity down to -165°C during LNG transfer operations.

Data source: Petrochemical Infrastructure Safety Council, 2023 Report

Technical FAQ: Gas Safety Valve Engineering

Q1: What certification standards apply to the SSDJ-FZ-*F/C-RQZ series?

These valves are certified to EN 161:2023 (Automatic shut-off devices for gas supply), ISO 23553-1:2021 (Safety and control devices), and ATEX Directive 2014/34/EU for explosive environments. Materials certifications include PED 2014/68/EU for pressure equipment.

Q2: What is the expected service life under continuous operation?

With proper maintenance cycles, the standard NBR-sealed version has a 10-year service life in natural gas environments at temperatures below 70°C. The Viton-sealed HP series extends this to 15 years in aggressive gas mixtures including those containing H₂S.

Q3: How do manual reset requirements enhance safety protocols?

The manual reset function ensures that after any cutoff event, engineers must physically inspect the system, diagnose the pressure anomaly cause, and deliberately reset the valve. This prevents automatic system restarts without safety verification.

Q4: What pressure sensor types are compatible with this valve?

This platform supports piezoelectric, strain gauge, and capacitive pressure sensors through its standardized sensing chamber. Popular options include the DIN-compliant G1/4" sensor modules with 4-20mA output or Modbus RTU communication protocols.

Q5: Can existing pipeline valves be retrofitted with these safety features?

Yes, OUYINUO provides flange adapter kits for retrofitting existing gate valves. The compact F/C-RQZ actuator module mounts vertically to valve stems with torque ratings up to 250Nm.

Q6: What maintenance procedures are required annually?

Annual procedures include: (1) Full-cycle valve actuation test, (2) Diaphragm integrity inspection, (3) Sensor calibration verification, and (4) Seal replacement every 5 years or 2,000 actuation cycles (whichever comes first).

Q7: How are catastrophic failure risks mitigated in design?

Three redundancy measures are implemented: (1) Secondary spring-loaded locking mechanism, (2) Independent overtravel prevention stops, and (3) Burst-proof diaphragm design certified to 5x max operating pressure.

Request Technical Documentation & Pricing

Download Product Specification (PDF)

For custom configurations or volume quotations, contact OUYINUO engineering team

+86-318-8289999
hboynrq@163.com

Industry References & Technical Literature

International Gas Union. (2023). Global Gas Safety Standards Evolution. Retrieved from iguglobal.org/safety-whitepaper
Energy Pipeline Journal. (2023). "Pressure Control Innovations in Gas Distribution". Vol 12(3), pp. 45-67. doi:10.1016/j.epj.2023.07.012
European Gas Research Group. (2023). Fail-Safe Valve Testing Protocol. Technical Report EGRG-TR-2023-08
American Society of Mechanical Engineers. (2022). "Material Selection for Gas Valve Components". ASME Gas Transmission Conference Proceedings