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Introduction to ZTN Series Brass Safety Valves

The ZTN series brass safety valve is a protective device used for low-temperature insulated gas cylinders or pipelines, primarily for pressure protection of containers. It serves as a pressure relief device to prevent container rupture. The valve is mainly used on low-temperature gas cylinders. When the pressure exerted by the medium inside the pipeline or container approaches the spring force, the seal becomes unbalanced, and a slight leakage begins. As the internal pressure continues to rise, the valve disc opens to release the pressure. As the fluid is discharged, the internal pressure gradually decreases. When the spring force exceeds the internal pressure, the valve disc is pushed back to the valve seat, sealing the valve.

Appearance and Connection Dimensions of Brass Low-Temperature Safety Valves

The ZTN series brass low-temperature safety valves are designed to be compact, offering excellent corrosion resistance and low-temperature performance. Their appearance and connection dimensions conform to international standards, making them compatible with various low-temperature gas cylinders and pipeline systems to ensure reliable sealing and stable operation.

Installation Guide for Brass Low-Temperature Safety Valves

a) Installation Location of the Safety Valve

  • The safety valve should be installed in a position that is easy to maintain and inspect.
  • When the pressure source of the protected system is an apparatus with pulsating pressure that is close to the set pressure of the safety valve, a buffer device should be installed before the valve to prevent abnormal frequent opening.
  • The safety valve should be installed vertically in sensitive areas of the pipeline or container where pressure fluctuations are expected.

b) Installation of the Safety Valve Inlet Pipe

  • The safety valve should be installed directly and vertically at the junction of the protected system’s container or pipeline, without the need for additional inlet piping. If an inlet pipe is required, its internal diameter should be no smaller than the inlet diameter of the safety valve, and the length should be as short as possible to reduce pipeline resistance.
  • Before installation, ensure that the pipeline is clean to prevent debris from entering the valve and causing leaks.
  • It is strictly forbidden to install a shut-off valve on the inlet pipe of the safety valve of a pressure vessel. In special cases, approval must be obtained from the technical responsible person for pressure vessel safety and the design department must agree, and appropriate safety measures should be taken.

c) Installation of the Safety Valve Discharge Pipe

  • The discharge pipe should have an internal diameter larger than the valve outlet diameter to ensure smooth discharge.
  • The flow resistance in the discharge pipe should be less than 10% of the safety valve’s set pressure to avoid excessive backpressure that could affect the valve’s performance.
  • The discharge pipe should be properly supported to prevent pipeline stress from being transmitted to the safety valve.
  • If multiple safety valves share a single discharge pipe, the discharge pipe should have sufficient discharge capacity, and the connection points of the branches with the main discharge pipe should have minimal directional changes.

d) Installation Support for Stability

  • To enhance the valve’s anti-vibration capabilities, sufficient support should be added during installation to prevent abnormal opening or damage due to vibrations.

Common Faults and Troubleshooting of Safety Valves

After installation, safety valves may experience various faults due to improper use or maintenance. These faults can affect the performance and lifespan of the valve. The common faults and their causes are as follows:

a) Safety Valve Leakage

  • Causes:
    • Contaminants on the sealing surface: If the pipeline is not cleaned before installation or the medium contains impurities, debris may enter between the valve seat and valve disc, causing leakage. In such cases, cleaning or factory repair is required.
    • Set pressure too close to the operating pressure: If the set pressure is too close to the operating pressure, the sealing pressure will be too low, leading to leakage. The set pressure should be raised, within the strength limits.
    • Spring relaxation: If the spring relaxes, it lowers the set pressure, causing leakage. This may be due to the safety valve loosening during operation, which causes early opening. In such cases, the safety valve should be recalibrated.

b) Safety Valve Fails to Open or Close Smoothly

  • Cause:
    • High resistance in the discharge pipe: If the discharge pipe has high backpressure, it may prevent smooth opening or adequate discharge. The discharge pipe should be modified to reduce resistance.

c) Safety Valve Frequent Cycling or Vibration

  • Causes:
    • Excessive discharge capacity: Ensure that the rated discharge capacity of the safety valve is as close as possible to the required discharge capacity of the system.
    • Small or high-resistance inlet pipe: Check the inlet pipe diameter and resistance to ensure it meets the requirements.
    • Excessive resistance in the discharge pipe: Reduce the resistance in the discharge pipe to prevent excessive backpressure that may affect the safety valve’s performance.

With proper installation and maintenance, the ZTN series brass safety valve can ensure the safe operation of equipment, preventing damage or accidents due to abnormal pressure.

About Our Author
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Johanna

CEO OF BORNIC Graduate school: Victoria Management Institute in Switzerland, fluent in English and Spanish, over 15 years of work experience, familiar with the entire process of product and business operations. Main clients are in Europe, South America, and North America. Skilled at analyzing customer backgrounds to improve conversion rates. Primary method for client development is combining customs data with LinkedIn.

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