Description
Schutte & Koerting Check Valves prevent backflow in steam and water lines to protect valuable equipment from damage.
Used in extraction lines from steam turbines to feedwater heaters, heating systems or process equipment, these valves are engineered for exceptional reliability. Under normal flow conditions, a counterbalance weight holds the disc in position for free flow of steam or water. However, the slightest back flow will cause the disc to close tightly against the seat, preventing reverse flow through the valve.
Where reverse flow is desired, the valves can be configured to remain open until closed by a cylinder actuator on signal.
S&K check valves are available in a variety of configurations for suitability to your application requirements. In addition, they can be manufactured with soft packing, hardened leak-off bushings, and various materials for critical applications.
Complete physical testing offered by S&K includes hydrostatic and pneumatic testing as well as magnetic particle (magnaflux) and radiographic (x-ray) inspection. All models are ANSI rated.
The basic Type 828 Check Valve protects against back flow of steam or water. The weight linked to the disc provides a delicate counterbalance to the weight of the disc itself. With normal flow in the proper direction the disc swings open to permit full flow. The slightest back flow will close the disc tightly against the seat, preventing reverse flow through the valve.
In applications where a controlled reverse flow is desired, these valves can be arranged to remain open until closed by a cylinder actuator on signal. Typical “hold open” arrangements are described on page 3.
In other applications these valves have been equipped with a spindle to act as both a stop and check valve.
Design Features
Simple on-line maintenance.
S&K check valves are designed to permit full access to internal components without removal from the pipeline. This can reduce maintenance and inspection costs considerably.
Reduced distortion.
Because S&K valves have a vertical seat, welding ends can be as long as needed without interfering with the use of a boring bar during finishing operations. This helps prevent distortion of the seat areas during welding and heat treating. The ends are located at least one pipe diameter away from the body proper in valves up to 4 inches, and up to 8 inches away in larger sizes.
Design Features
Rapid closure in response to backflow.
The S&K check valve is designed to permit full flow when open only 55° from vertical (below). This disc position makes the valve far more sensitive to backflow and results in faster closing than possible with other designs.
Low pressure drop.
The unique full-flow disc position described above, together with the straight-line flow characteristics of its globe-shaped body, produce minimal pressure drop through the valve.
Minimal valve binding.
Rockshafts are made of stainless steel with bushings of Monel. Freezing or binding is far less likely to occur than in valves using less corrosion-resistant materials. When intended for service in vacuum lines, rockshafts are provided with water seal lanterns.
basic configuration and comPonents of standard ValVe body
Configuration Options
Schutte & Koerting offers check valves in a variety of standard configurations to maximize application versatility and meet special service conditions. The configurations described are just the beginning of the tremendous versatility offered by S&K. Many of our customers count on us to apply our custom application engineering to meet the specific requirements of the installation.
standard body designs
Basic Check Valve
Controlled Reverse Flow
specifications
