German Sterling SIHI valves, Sterling SIHI models, Sterling SIHI prices

Sterling SIHI 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 that to open it; hence, the stem diameter must be large enough to prevent bending failure. Connection methods are classified into three types: flange connection, threaded connection, and welded connection. After the emergence of self-sealing valves, the flow direction in globe valves changed to enter the valve cavity from above the disc. In this configuration, under medium pressure, the closing force is smaller while the opening force is larger, allowing for a corresponding reduction in stem diameter. Meanwhile, this valve design offers tighter sealing under medium action. China's valve "Three Standardizations" once stipulated that the flow direction for globe valves must always be top-to-bottom. When a globe valve opens, once the disc lift reaches 25% to 30% of the nominal diameter, the flow rate has already reached its maximum, indicating that the valve is fully open. Therefore, the fully open position of a globe valve is determined by the disc travel.

Sterling SIHI Valve Operating Principles and Characteristics

Valves play a crucial role in cutting off and throttling the medium within their respective pipelines. 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 tightly mate with 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, facilitating easy flow regulation. Additionally, manufacturing and maintenance are convenient, and the pressure application range is wide.

Sterling SIHI Valve Specification Considerations

Acceptance follows HG 20202-2000 "Code for Construction and Acceptance of Degreasing Engineering". Before assembly, each component is wiped with clean precision filter paper; selecting dead corners of the component, no color change on the filter paper indicates compliance. 1) The valve model shall indicate the applicable national standard number. If an enterprise standard applies, relevant model specifications shall be provided. 2) Valve working pressure shall be ≥ pipeline working pressure; without affecting price, the valve's allowable working pressure should exceed the actual pipeline working pressure. 3) Valve manufacturing standard: specify the applicable national standard number; if an enterprise standard applies, attach enterprise documentation to the procurement contract.

Sterling SIHI Valve Classification

1) Straight-through globe valve 2) Y-pattern globe valve: In Y-pattern or Y-pattern globe valves, the valve body flow passage forms an oblique angle with the main flow path. This results in less disruption to the flow state compared to conventional globe valves, thus reducing the pressure loss across the valve. 3) Angle globe valve: In angle globe valves, the fluid changes direction only once, resulting in a lower pressure drop across the valve compared to conventional structures. American Standard Bellows Globe Valve ZDAJ41W Type Stainless Steel Body American Standard Bellows Globe Valve ZDAJ41W Type Stainless Steel Body 4) Plunger globe valve: This type of globe valve is a variant 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 onto 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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