16" x 12" 600LB trunnion mounted ball valve is made according to API6D standard. The valve body is made of A105. It has the structural characteristics of split type, side mounted, fixed ball, reduced diameter. Its connection mode is RF. And it has pneumatic operation mode.
16" 150LB double eccentric butterfly valve twins are made according to API 609 standard. The valve body is made of ASTM A216 WCB. It has the structural characteristics of high performance and dual eccentricity. Two valves share one worm gear head. Its connection mode is wafer. And it has turbine operation mode.
1" 300LB steam trap valve is made according to GB/T22654-2008 standard. The valve body is made of LF2 CL1. It has the structural characteristics of thermodynamic type. Its connection mode is RF.
2" 300LB change over valve is made according to ASME B16.34 standard. The valve body is made of ASTM A216 WCB. It has the structural characteristics of plug cover, the overall internal material is F316L. Its connection mode is RF. And it has Handwheel operation mode.
12" 1500LB cast steel slab gate valve is made according to API 6D standard. The valve body is made of A216 WCB. It has the structural characteristics of body cover bolt, full flow, cleanable pipe, anti-fire design. Its connection mode is RTJ. And it has gearbox operation mode.
DN200 PN16 angle bellows sealed globe valve is made according to BS EN 13709 standard. The valve body is made of EN 10213 1.4408. It has the structural characteristics of body cover bolt, exposed pole bracket, angle type, bellow seal. Its connection mode is RF. And it has hand wheel operation mode.
DN300 PN63 ball valve is made according to API 6D standard. The valve body is made of ASTM A105. It has the structural characteristics of fixed ball, full bore, anti-fire, anti-static, and anti-flying valve stem. Its connection mode is EN1092-1 D. And it has worm wheel operation mode.
16" 900LB ball valve is made according to API 6D standard. The valve body is made of A350 LF2. It has the structural characteristics of fully welded, fixed ball and full bore. Its connection mode is BW. And it has turbine operation mode.
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...
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...
If you are interested in our products and want to know more details,please leave a message here,we will reply you as soon as we can.
"Everything is perfectly made. We are grateful for the confidence you are showing in our organization and fully trust our hard-work will be fruitful for both of our companies. You are truly a GEM for Dervos Valves. Our best compliments to you!"
"Your customer service is outstanding. ... ... The check valves works fine and the customer service certainly makes up for it. ... ... The customer service couldn’t be better."
"We are very satisfied with all your kind business supports. You are always kindly answering all our questions. So, we thank you for all your efforts. When we have any new project, we will readily make a contact with you!"
"I’ve received your document today. Thank you so much. Our engineer says your report seems to have been done quite well, he appreciated, of course we haven’t got the vannes so we haven’t had a check, but I believe there won’t be problem, hope so."
"Thank you for engaging with our organisation regarding Dervos. We place various orders with Dervos and products were always completed ex-factory, to drawing and within the time periods indicated. Dervos is a very proud company and place huge emphasis in delivering quality products to their customers."