Sometimes it is hard to choose between using a knife gate valve or a butterfly valve for certain applications. Both have their merits and both should be picked according to the media and how it will be used. Both are available in manual operation (hand wheel, gear box or lever) as well as withpneumatic or electric actuators Ask these questions before making the choice: l Is the media abrasive? l Will there be large suspended solids? l Is there likely to be solid material present in the line when closing? If the answer to any of the above question is yes, a knife gate valve is what you’re supposed to have. Typical applications for knife gate valves include; - Sewerage & Effluent - Vacuum Trucks - Fluid Transfer Trucks - Slurry - Grain Silos Xiamen Dervos is an API Certified check valve manufacturing and trading company that specializes in the production of various kinds of valve. In addition toKnife gate valve, we also produce other industrial pipeline valves, such as ball valves, globe valves, plug valves and butterfly valve. To learn more about our industry-leading products, contact us today.

WAFER check valve is a general one-way valve for fluid.Lightweight, small-sized, WAFER check valve iseasy to install between the flange. The interior of the valve consists of two semi-circular taut springs and plates that fixed to the valve body with a pin. Moving fluid make the spring deform and get through the valve. The valve closes when the spring lose fluid pressure. The spring deforms quickly, which keeps the pipeline from the damage of water hammer. Keep these in mind when install WAFER check valve 1. First, the priority among priorities, make sure the opening direction is in line with the the flow direction when you put your WAFER check valve in place. 2. Put them in vertical pipelines and, for horizontal pipelines, install check valves vertically. 3. Use a expanding tube between the WAFER check valve and the butterfly valve. Don’t connect them to other valves directly. 4. Keep pipe joints and blockagesaway from the operating radius of the valve plate. 5. Do not install a reducer in front of or perhaps behind the WAFER check valve. 6. When the WAFER check valve have to be installed near a elbow pipe, leave a large enough space. 7. If WAFER check valve is placed at the outlet of pump , allow space at least six times the diameter of the valve to ensure that the butterfly plate can be pushed by fluid. Xiamen Dervos is an API Certified check valve manufacturing and trading company that specializes in the production of various kinds of valve. In addition to WAFER check valve, we also produce other industrial pipeline valves, such as gate valves, ball valves, globe valves, plug valves and butterfly valve. To learn more about our industry-leading products, contact us today.

Dervos successfully passed the API-6D certification issued by the American Petroleum Institute (API), and today the certificate has been granted to Dervos, which is another upgrade of our qualification!   In order to achieve deeper cooperation with customers, and to further meet the ever-increasing needs of our customers，Dervos has been constantly striving to improve the quality of our products and production strength, and to provide better products and services to our customers. We look forward to working with our customers to achieve a win-win situation!   API certification   API is the abbreviation of American Petroleum Institute (API), which was established in 1919 and is the first national business association in the United States and one of the earliest and most successful standard-setting chambers of commerce in the world.   The organization was based on the characteristics of the industry and the needs of the industry itself. The API Code was developed in 1924 to provide technical specifications to guide the production of products related to the petroleum industry. Due to the advanced, universal and safe nature of the API Code developed by the API Organization and the expanding influence of the US oil industry in the world, the API Code has been widely adopted by countries around the world. As a result, the API Organization, originally meant to be an academic organization for the US petroleum industry, has now evolved into an authoritative academic organization for the petroleum industry that crosses national boundaries.