German Dietrich Schwabe valves, Dietrich Schwabe models, Dietrich Schwabe prices

Dietrich Schwabe valves, also known as globe valves, belong to the forced-sealing valve category. Therefore, when the valve is closed, pressure must be applied to the disc to ensure a leak-tight seal. When the medium enters the valve from below the disc, the resistance that the operating force must overcome consists of the friction between the stem and packing, plus the thrust generated by the medium pressure. The force required to close the valve is greater than the force required to open it; therefore, the stem diameter must be large enough to prevent bending failure. Connection methods are divided into three types: flange connection, threaded connection, and welded connection. Since the advent of self-sealing valves, the flow direction in globe valves has changed so that the medium enters the valve cavity from above the disc. In this configuration, under the action of medium pressure, the closing force is smaller while the opening force is larger, allowing the stem diameter to be reduced accordingly. At the same time, this valve design provides tighter sealing under medium pressure. China's valve "Three Modernizations" regulations previously stipulated that the flow direction for globe valves must always be top-to-bottom. When a globe valve is opened, the flow rate reaches its maximum when the disc lift height is 25% to 30% of the nominal diameter, indicating that the valve has reached its fully open position. Therefore, the fully open position of a globe valve should be determined by the disc travel.

Dietrich Schwabe valve operating principles and characteristics

Valves play an important role in cutting off and throttling the medium in the pipeline where they are installed. As an extremely important type of shut-off valve, the globe valve achieves sealing by applying torque to the stem, which exerts axial pressure on the disc, causing the disc sealing surface to fit tightly against the seat sealing surface, thereby preventing medium leakage through the gap between the sealing surfaces. The sealing pair of a globe valve consists of the disc sealing surface and the seat sealing surface. The stem drives the disc to move vertically along the centerline of the seat. During the opening and closing process of a globe valve, the lift height is small, making it easy to regulate flow. Additionally, manufacturing and maintenance are convenient, and the pressure application range is wide.

Dietrich Schwabe valve specification precautions

Acceptance follows HG 20202-2000 "Code for Construction and Acceptance of Degreasing Engineering". Before assembly, each component is wiped with clean precision filter paper; if the filter paper does not change color when selected dead corners of the component are wiped, it is considered qualified. 1) The valve model shall indicate the applicable national standard number. If an enterprise standard applies, relevant specifications for the model shall be provided. 2) The valve working pressure shall be ≥ the pipeline working pressure; without affecting the price, the pressure the valve can withstand should be greater than the actual pipeline working pressure. 3) For the valve manufacturing standard, the applicable national standard number shall be stated; if an enterprise standard applies, the enterprise documentation shall be attached to the procurement contract.

Dietrich Schwabe valve classification

1) Straight-through globe valve 2) Angle-pattern globe valve: In angle-pattern or Y-pattern globe valves, the flow passage in the valve body forms an oblique line with the main flow path. This results in less disruption of the flow state compared to conventional globe valves, and thus the pressure loss through the valve is correspondingly lower. 3) Angle-stop globe valve: In angle-stop globe valves, the fluid changes direction only once, resulting in a lower pressure drop through this valve compared to conventional globe valve structures. American Standard Bellows Globe Valve ZDAJ41W Type Stainless Steel Body American Standard Bellows Globe Valve ZDAJ41W Type Stainless Steel Body 4) Plunger-type globe valve: This form of globe valve is a variation of the conventional globe valve. In this valve, the disc and seat are typically designed based on the plunger principle. The disc is polished into a plunger shape and connected to the stem. Sealing is achieved by two elastic sealing rings fitted around the plunger. The two elastic sealing rings are separated by a collar, and the sealing rings around the plunger are compressed tightly by the load applied to the bonnet via the bonnet nuts. The elastic sealing rings are replaceable and can be made from various materials. This valve is primarily used for "on" or "off" service, but with specially designed plungers or collars, it can also be used for flow regulation.

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