Circle Seal 产品的出众表现可以追溯到1947年公司成立之初。当时，初出茅庐的Circle Seal Controls 向市场推出了他的第一个创新产品：使用非固定O型环型密封的止回阀，保证了绝对的密封。随着客户需求的不断增长，Circle Seal Controls 日趋壮大。

　　如今，Circle Seal Controls 生产制造多种规格的控制阀门及控制器，向工业仪表领域、原始设备制造商、航空航天及军事领域提供专业产品和服务。经过50多年的发展，Circle Seal Controls 在高品质单向阀、放卸阀、电磁阀、减压阀、阀组，以及仪表控制阀门等产品领域建立了领先地位。同时，Circle Seal Controls 在工程、制造、质量控制、市场推介等领域向用户提供支持以协助用户在新应用方面的设计和制造。

产品包括：
Check Valves止回阀/单向阀
Circle Seal Controls - Fluid Control Products offers a wide range of check valves. Operating pressure ranges include 0–25, 0–800, 0–3000, 0–5000, 0–6000, and 0–10,000 psig. Body materials typically include 303 & 316 stainless steel and brass. Operating temperatures cover −70° to +550° F (−390° to +288° C).

Pressure Regulators压力调节器
Back Pressure • Dome Loaded • Manual Adjusted
Circle Seal Controls offers a comprehensive line of manual adjusted and dome-loaded pressure regulators, and back pressure regulators. Body materials include brass, 316 stainless steel, and polyvinyl chloride, depending on the model. Typical seat materials include Neoprene, Tefzel®, TFE, PTFE, Polyimide, and PEEK™.

Relief Valves安全阀
Choose from a wide range of high quality relief valves. Operating pressures range from vacuum to 10,500 psig. Body materials typically include 303 & 316 stainless steel and brass. Operating temperatures range from −320° to +550° F (−196° to +288° C).

Manual Shutoff Valves手动截止阀
Circle Seal Controls - Fluid Control Products offers a wide variety of manual shutoff valves include plug, 3-way selector, miniature, pneumatically actuated, micro-metering fingertip, glove, and angle styles. Body materials include 303 & 316 stainless steel, and brass.



Solenoid Valves高压电磁阀
Choose from 2- and 3-way solenoid valves for gas or liquid service. Body materials include brass, 303 stainless steel, and aluminum. Pressure range choices are vacuum to 3000 psig (207 barg) and vacuum to 6000 psig (404 barg). Operating temperature range is −65° to +160° F (−54° to +71° C).