If you have ever experienced project delays due to valve quality issues, or are in the process of selecting qualified valve suppliers for an upcoming industrial project, then understanding the essential inspection reports required when purchasing gate valves becomes critically important. As a key control component in piping systems, the quality of a valve directly affects the safety and reliability of equipment operation. Therefore, when purchasing gate valves, buyers should not only focus on price and delivery time but also ensure that the supplier can provide complete inspection reports.   Mandatory Inspection Reports   ● Material Test Report (MTR) Purpose: To verify that the main components of the valve, such as the body, bonnet, and stem, meet the specified material standards (e.g., ASTM, DIN, EN). Importance: Prevents valve failure under corrosive or high-pressure conditions due to substandard materials.   ● Pressure Test Report Hydrostatic Test: Checks the valve’s strength under the specified pressure. Air Tightness Test: Ensures the valve does not leak at operating pressure. Importance: Confirms that the valve meets the required design pressure rating.   ● Dimension Inspection Report Content: Verifies whether valve structural length, flange dimensions, wall thickness, etc., comply with design and standards (ANSI, EN, GB). Importance: Ensures proper alignment with the piping system and prevents installation deviations.   ● Non-Destructive Test (NDT) Report Methods: Includes Ultrasonic Testing (UT), Radiographic Testing (RT), Magnetic Particle Testing (MT), and Penetrant Testing (PT). Importance: Verifies that castings or welds are free from internal defects, enhancing the valve’s long-term operational reliability.   ● Coating & Painting Test Report Content: Checks paint thickness, adhesion, hardness, salt spray resistance, etc. Importance: Ensures the valve has strong corrosion resistance for outdoor, marine, or chemical environments.   ● Final Inspection Report Content: Includes comprehensive records of appearance, operational performance, markings, packaging, and other inspection items. Importance: Demonstrates that the valve has undergone strict quality control before delivery.   Conclusion   When purchasing gate valves, requiring suppliers to provide complete inspection reports is not only a verification of product quality but also a guarantee of overall project safety and reliability. By reviewing these reports, customers can reduce operational risks, lower maintenance costs, and extend the service life of their equipment.   Q&A   Q1: Why is a Material Test Report (MTR) mandatory when purchasing gate valves? A1: Material determines the valve’s pressure resistance, corrosion resistance, and service life. Different operating conditions require specific materials, so an MTR is necessary to verify compliance.   Q2: Is Non-Destructive Testing (NDT) require...

Stainless Steel Flanged Ball Valve is a commonly used industrial valve. Its closure element (the ball) is driven by the valve stem and rotates around the axis of the ball valve, thereby enabling the opening and closing of the pipeline as well as fluid control. In addition to simple on/off functions, stainless steel flanged ball valves can also be used for fluid regulation. In particular, hard-sealed V-port ball valves, relying on the strong shearing force between the V-shaped ball core and the hard alloy-welded seat, are especially suitable for media containing fibers or fine solid particles.   In industrial applications, multi-port stainless steel flanged ball valves can flexibly achieve medium merging, diversion, and flow switching, while also being able to shut off any single passage to ensure normal operation of the remaining pipelines.  these valves generally require horizontal installation to maintain long-term stable performance. According to the driving method, stainless steel flanged ball valves can be classified into manual, pneumatic, and electric types, meeting the needs of different operating conditions.     Standards for Stainless Steel Flanged Ball Valves   To ensure reliable performance and consistent quality, stainless steel flanged ball valves comply with the following standards: • Design and Manufacturing: GB12237-89, API608, API 6D, JPI 7S-48, BS5351, DIN3357; • Flange Dimensions: JB/T74–90, GB9112–9131, ANSI B16.5, JIS B2212–2214, DIN2543,EN1092; • Face-to-Face Dimensions: GB12221-89, ANSI B16.10, JIS B2002, DIN3202,EN558; • Inspection and Testing: JB/T 9092, API 598,API6D. These standards not only guarantee the interchangeability and compatibility of the valves but also ensure their safety and reliability in various industrial environments.     Models and Specifications of Stainless Steel Flanged Ball Valves   Common models and parameters of stainless steel flanged ball valves include: Electric Flanged Ball Valve Q941F: Size DN15–200, Pressure 0.6–10 MPa, Material: Cast Steel / Stainless Steel Carbon Steel ANSI Ball Valve Q41F: Size DN15–200, Pressure 150LB–900LB, Material: Carbon Steel / Cast Steel ANSI Stainless Steel Ball Valve Q41F: Size DN15–200, Pressure 150LB–900LB, Material: Stainless Steel Worm Gear Flanged Ball Valve Q341F: Size DN15–200, Pressure 0.6–6.4 MPa, Material: Carbon Steel / Stainless Steel Pneumatic Stainless Steel Ball Valve Q641F: Size DN15–200, Pressure 0.6–6.4 MPa, Material: Stainless Steel     Main Features of Stainless Steel Flanged Ball Valves   •  Excellent Wear Resistance: The core of the hard-sealed ball valve is overlaid with alloy steel, and the valve seat is surfaced with alloy steel, ensuring strong wear resistance. • Reliable Sealing Performance: Precision grinding guarantees a perfect fit between the ball and the seat, prev...

In pipeline systems, the Shutdown Valve is a key component for ensuring safe and efficient operation. Especially when handling high-pressure, high-temperature, flammable, or toxic media, the globe valve, as a common type of Shutdown Valve, plays a critical role. Compared to other types of valves, the structure and working principle of the globe valve make it one of the preferred choices for efficient and safe pipeline control.     1.Basic Function of the Shutdown Valve   In pipeline systems, the Shutdown Valve is a key component for ensuring safe and efficient operation. Especially when handling high-pressure, high-temperature, flammable, or toxic media, the globe valve, as a common type of Shutdown Valve, plays a critical role. Compared to other types of valves, the structure and working principle of the globe valve make it one of the preferred choices for efficient and safe pipeline control.     2.Role of the Shutdown Valve in Safety   Shutdown Valves play a critical safety role in many industrial applications, especially in pipeline systems that handle high-risk, flammable, or toxic media. The superior performance of the Shutdown Valve makes it an ideal choice for preventing dangerous leaks. For example, in the transportation of oil, natural gas, chemicals, and other hazardous substances, the Shutdown Valve can efficiently and quickly close the pipeline flow, preventing harm to the environment and personnel safety. Additionally, Shutdown Valves are widely used in steam systems, cooling water systems, and high-pressure gas pipelines. In these applications, the Shutdown Valve not only ensures safe operation but also effectively regulates flow, controls pipeline pressure, and prevents both overpressure and underpressure in the system, thereby maintaining the stability of the pipeline system.     3.Impact of the Shutdown Valve on Efficient Operation   The Shutdown Valve, known for its reliable sealing performance and low flow resistance, is a crucial tool for achieving efficient flow control in pipeline systems. Compared to other valve types, the design of the Shutdown Valve focuses not only on ensuring a tight shutoff but also on its flow regulation capabilities. While it is not specifically designed for flow control, in certain cases, the Shutdown Valve can serve a limited flow regulation function, especially in systems with relatively low flow rates. For optimal operation, the Shutdown Valve requires regular inspection and maintenance to ensure its sealing integrity and functionality. In high-pressure or high-temperature environments, the valve's sealing surfaces are vulnerable to erosion or damage. Therefore, proper maintenance measures are essential to extend the valve's service life and ensure the safe and efficient operation of the system.     4. Selection and Application of the Shutdown Valve   When selecting the appropriate Shutdown Valve, several factors should be considered: Me...

The butterfly valve, as a compact, quick-opening, and low-resistance regulating valve, is widely used in industries such as water supply and drainage, HVAC, power, chemical, and paper-making. However, in practical engineering applications, improper consideration of the butterfly valve’s installation direction and spatial arrangement often leads to valve operating abnormalities, decreased sealing performance, and deviations in control accuracy. In severe cases, it can even cause system failures or frequent maintenance, resulting in unnecessary economic losses. Therefore, a correct understanding of the impact of installation orientation and spatial layout on butterfly valve performance is essential to ensure its reliable operation and extend its service life.     1. The Impact of Installation Orientation on Butterfly Valve Performance   (1) Fluid Flow Direction and Its Effect on Sealing Performance For centerline butterfly valves, where the valve disc rotates around the valve shaft, the force is relatively symmetric, and the fluid flow direction has little impact on the sealing performance. Therefore, the flow direction requirement is not strict during installation. However, for eccentric butterfly valves, especially double-eccentric and triple-eccentric types, the seal design is based on the "flow-assisted compression" principle. That is, when the medium pressure comes from the specified direction, it pushes the valve disc toward the sealing seat, thereby enhancing the sealing effect.   If the valve is installed in the opposite direction of the flow arrow marked by the manufacturer, the reverse fluid flow will wash the valve disc. Not only will the expected sealing effect not form, but it may also create gaps between the sealing surfaces, accelerate valve seat wear, and cause internal leakage, making it impossible to close the valve completely. Therefore, the installation of eccentric butterfly valves must strictly follow the flow direction requirements.   (2) Valve Shaft Orientation and Its Effect on Opening/Closing Torque and Actuator The installation orientation of the valve shaft (horizontal or vertical) has a significant impact on the opening/closing performance, valve body stress, and actuator life. Most medium and small-sized butterfly valves are installed with the valve shaft in the horizontal position. This method facilitates the alignment of the valve body with the pipeline and the arrangement of the actuator.   However, for large-diameter butterfly valves or those installed in high locations or vertical pipelines, the valve shaft is often vertical. In this position, the weight of the valve disc directly acts on the valve shaft, especially when the valve disc is in the open position, where its center of gravity deviates from the axis, creating a large eccentric torque and increasing the axial load during opening and closing. If the actuator does not account for this additional load, it may result in po...

YPFB (Yacimientos Petrolíferos Fiscales Bolivianos) as Bolivia's state-owned oil and gas company, plays a critical role in the exploration, production, and distribution of oil and natural gas across Bolivia. It has a strong commitment to quality and innovation. DERVOS VALVE is honored to have passed the qualification review and become one of contract valve suppliers of YPFB.   • Supplier Qualification Requirements for YPFB Becoming a supplier for YPFB requires meeting several stringent qualifications. YPFB looks for suppliers with a proven track record of reliability, technical expertise, and product quality. This includes compliance with international industry standards and certifications,along with the ability to provide high-performance products that meet the specific needs of Bolivia’s oil and gas industry. The process also involves submitting detailed technical documentation, including certifications, safety records,and previous successful project references.   •  Application Process to Become a YPFB Supplier The application process to become a certified supplier for YPFB is highly competitive and rigorous. The first step is to submit an official application, followed by a review of the company’s credentials. Dervos Valve underwent this process and provided comprehensive technical documentation, including product specifications and compliance with safety standards. Our team also participated in interviews and site visits, showcasing our manufacturing capabilities and commitment to quality. DERVOS VALVE will supply a range of valves to YPFB for use in their oil and gas operations, including high-performance ball valves, gate valves, globe valves, and check valves. These products are crucial for ensuring the safety and efficiency of operations in challenging conditions.   Dedicated to consistent product quality through daily operations, we ensure excellence in performance. Our ongoing commitment is providing partners with professional support and premium services, fostering mutual growth and win-win success.  

To mark this milestone in Dervos Valve’s journey, we came together not just to celebrate, but to connect with the partners who have supported us along the way. This anniversary is a tribute to enduring partnerships and a sha- red vision for the future.   On the occasion of Dervos Valve’s 17th anniversary, our valued partners were specially invited to visit our headquarters for in-depth, face-to-face exchanges with the team. These meaningful interactions deep- ened mutual understanding andtrust, laying a solid foundation for even stronger cooperation in the future.   Accompanied by our team, the clients toured the office area and were introduced to colleagues from various departments. The interactions were relaxed and friendly, creating a warm atmosphere that further strengthened mutual understanding. Following the tour, our sales team delivered a themed presentation on “Dervos 17th Anniversary,” offering the clients a comprehensive overview of the company's development journey, core strengths, and service philosophy. We also expres- sed our heartfelt gratitude and warm welcome to our valued partners. Through this session, the clients gained a deeper understanding of Dervos, enabling us to better tailor our services to their needs. They expressed strong appreciation for Dervos’ steady growth and thanked us for inviting them to be part of this meaningful celebration.   In front of the company’s cultural wall, clients took a moment to sign and leave messages, expressing their well wishes for Dervos. This moment not only reflected cultural recognition but also a genuine expression of the emotional bond and trust shared through our partnership.   Next, we arrived at the highlight of the anniversary celebration— the Dervos Valve 17th Anniversary Gala Dinner, a moment of gratitude and shared celebration. We arranged a visit to the "Yu Jian Minnan" Cultural Park for our clients, where they explored the ancient architectu- ral district and experienced the traditional art of rubbings, immersing themselves in the charm and craftsman- ship of Chinese culture.   In the evening, a red carpet was laid out in front of the hotel, where the Dervos team warmly welcomed guests, coming together with partners from around the world to witness this moment of honor. As the lights came on, the anniversary gala dinner officially began. The venue was decorated in a grand and festive style, with a warm and lively atmosphere. The event kicked off with a performance that blended both Eastern and Western cultures,featuring a lineup of classic foreign songs and traditional Chinese pieces, showcasing Dervos' open and inclusive brand spirit, with a global outlook. During the interactive games and lucky draw sessions, guests actively participated and enjoyed themselves, with laughter and joy filling the air. This lively atmosphere showcased the cohesion and energy of the Dervos team.   As the familiar melo...