German Sferaco valves Sferaco models Sferaco prices

Sferaco 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 and 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. According to the connection method, they are divided into three types: flange connection, threaded connection, and welded connection. Since the advent of self-sealing valves, the medium flow direction in globe valves has changed to enter the valve cavity from above the disc. In this case, 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 type of valve offers tighter sealing under medium action. China's valve "Three Modernizations" regulations stipulated that the flow direction of globe valves must always be from top to bottom. When a globe valve is opened, the flow rate reaches its maximum when the disc opening height is 25% to 30% of the nominal diameter, indicating that the valve has reached the fully open position. Therefore, the fully open position of a globe valve should be determined by the travel of the disc.

Sferaco valve working principles and characteristics

Valves play an important role in cutting off and throttling the medium in the pipeline where they are located. 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, 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, it is convenient to manufacture and maintain, and has a wide pressure application range.

Sferaco 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 wiping dead corners of the components, it is considered qualified. 1) The valve model should indicate the required national standard number. If it is an enterprise standard, relevant explanations of the model should be provided. 2) The valve working pressure must be ≥ the pipeline working pressure. Without affecting the price, the working pressure the valve can withstand should be greater than the actual working pressure of the pipeline. 3) For valve manufacturing standards, the applicable national standard number should be specified. If it is an enterprise standard, enterprise documents should be attached to the procurement contract.

Sferaco valve classification

1) Straight-through globe valve 2) Y-pattern globe valve: In Y-pattern or Y-pattern globe valves, the flow passage of 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 smaller. 3) Angle globe valve: In angle globe valves, the fluid only needs to change direction once, resulting in a lower pressure drop through this valve compared to conventional structure globe valves. American standard bellows globe valve ZDAJ41W type stainless steel valve body American standard bellows globe valve ZDAJ41W type stainless steel valve body 4) Plunger globe valve: This form of globe valve is a variant of the conventional globe valve. In this valve, the disc and seat are usually designed based on the plunger principle. The disc is polished into a plunger and connected to the stem. Sealing is achieved by two elastic sealing rings fitted on 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 mainly used for "on" or "off" service, but with specially designed plungers or special collars, it can also be used for flow regulation.

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