What are the inspection procedures for a Straight Way Globe Valve before installation?

As a supplier of Straight Way Globe Valves, I understand the critical importance of conducting thorough inspection procedures before installation. These procedures are not only crucial for ensuring the proper functioning of the valve but also for maintaining the safety and efficiency of the entire system. In this blog post, I will share the detailed inspection procedures for a Straight Way Globe Valve before installation.

Angle Type Globe Valve Angle Type Globe Valve2

External Visual Inspection

The first step in the inspection process is a comprehensive external visual inspection. This involves carefully examining the valve for any visible damage, defects, or signs of corrosion. Here are the key aspects to focus on:

Body and Bonnet: Inspect the valve body and bonnet for cracks, dents, or any other physical damage. Check for any signs of weld defects, such as porosity or incomplete fusion. Ensure that the body and bonnet are properly machined and have smooth surfaces.
Flanges: Examine the flanges for damage, misalignment, or uneven surfaces. Check the flange faces for scratches, nicks, or corrosion. Ensure that the flange bolt holes are properly aligned and free of debris.
Handwheel or Actuator: If the valve is equipped with a handwheel or actuator, inspect it for proper operation. Check for any signs of damage, such as broken handles or loose connections. Ensure that the handwheel or actuator rotates smoothly and that the valve can be opened and closed without excessive force.
Nameplate and Tags: Verify that the valve nameplate and tags are legible and contain accurate information, including the valve size, pressure rating, material, and manufacturer's details.

Dimensional Inspection

After the external visual inspection, the next step is to perform a dimensional inspection to ensure that the valve meets the specified requirements. This involves measuring various dimensions of the valve and comparing them to the engineering drawings or specifications. Here are the key dimensions to check:

Valve Length: Measure the overall length of the valve from end to end. Ensure that the length is within the tolerance specified in the engineering drawings.
Flange Dimensions: Measure the flange outer diameter, bolt circle diameter, flange thickness, and bolt hole diameter. Check that the flange dimensions comply with the relevant standards, such as ANSI, DIN, or JIS.
Seat and Disc Dimensions: Measure the seat and disc diameters, as well as the seat width. Ensure that the seat and disc dimensions are within the specified tolerance and that they are compatible with each other.
Stem Diameter and Length: Measure the stem diameter and length. Check that the stem diameter is within the specified tolerance and that the stem length is sufficient to ensure proper valve operation.

Pressure Testing

Pressure testing is a critical step in the inspection process to ensure the integrity and leak-tightness of the valve. There are two main types of pressure tests for Straight Way Globe Valves: shell test and seat test.

Shell Test: The shell test is performed to check the integrity of the valve body and bonnet. The valve is filled with a test fluid, usually water or oil, and pressurized to a specified test pressure for a certain period of time. The test pressure is typically higher than the valve's maximum operating pressure. During the test, the valve is checked for any signs of leakage, such as dripping or seepage.
Seat Test: The seat test is performed to check the leak-tightness of the valve seat and disc. The valve is closed, and a test fluid is applied to the upstream side of the valve at a specified test pressure. The pressure is then maintained for a certain period of time, and the downstream side of the valve is checked for any leakage. The test pressure for the seat test is usually lower than the shell test pressure.

Material Verification

Material verification is an important step to ensure that the valve is made from the correct materials and meets the specified requirements. This involves checking the material certificates, markings, and chemical composition of the valve components. Here are the key aspects to focus on:

Material Certificates: Verify that the valve comes with material certificates that provide information about the chemical composition, mechanical properties, and heat treatment of the valve components. Check that the material certificates are issued by a reputable testing laboratory and are in compliance with the relevant standards.
Material Markings: Check the valve body, bonnet, stem, and other components for material markings. The markings should indicate the material grade, such as ASTM A105 for carbon steel or ASTM CF8 for stainless steel. Ensure that the material markings are consistent with the material certificates.
Chemical Composition Analysis: If necessary, perform a chemical composition analysis of the valve components using techniques such as spectroscopy or wet chemistry analysis. This will help to confirm the material grade and ensure that the valve meets the specified requirements.

Operational Inspection

In addition to the above inspections, it is also important to perform an operational inspection to ensure that the valve operates smoothly and functions properly. This involves testing the valve's opening and closing operations, as well as its flow control capabilities. Here are the key aspects to focus on:

Opening and Closing Operations: Operate the valve manually or using an actuator to check its opening and closing operations. Ensure that the valve opens and closes smoothly without any binding or excessive force. Check that the valve reaches its fully open and fully closed positions and that the position indicators are accurate.
Flow Control Capabilities: If the valve is designed for flow control applications, test its flow control capabilities by adjusting the valve position and measuring the flow rate. Ensure that the valve can provide accurate flow control within the specified range.
Sealing Performance: Check the sealing performance of the valve by applying a slight pressure on the downstream side of the valve and observing for any leakage. Ensure that the valve provides a tight seal when closed.

Documentation Review

Finally, it is important to review the valve documentation to ensure that all the required information is provided and that the valve meets the specified requirements. This includes reviewing the valve drawings, specifications, material certificates, test reports, and operating manuals. Here are the key aspects to focus on:

Valve Drawings and Specifications: Review the valve drawings and specifications to ensure that the valve meets the design requirements. Check that the valve dimensions, pressure ratings, material grades, and other parameters are consistent with the engineering drawings and specifications.
Material Certificates and Test Reports: Review the material certificates and test reports to ensure that the valve components are made from the correct materials and that the valve has passed all the required tests. Check that the test results are within the specified acceptance criteria.
Operating Manuals: Review the operating manuals to ensure that the valve can be installed, operated, and maintained correctly. Check that the operating manuals provide clear instructions on how to open and close the valve, how to perform maintenance tasks, and how to troubleshoot common problems.

In conclusion, conducting thorough inspection procedures before installing a Straight Way Globe Valve is essential for ensuring its proper functioning, safety, and reliability. By following the inspection procedures outlined in this blog post, you can minimize the risk of valve failure and ensure the long-term performance of your system.

If you are interested in purchasing Straight Way Globe Valves or have any questions about our products, please feel free to contact us for more information. We look forward to discussing your requirements and providing you with the best possible solutions.

Straight Way Globe Valve
Angle Type Globe Valve