Circle Seal 產品的出眾表現可以追溯到1947年公司成立之初。當時，初出茅廬的Circle Seal Controls 向市場推出了他的第一個創新產品：使用非固定O型環型密封的止回閥，保証了絕對的密封。隨着客戶需求的不斷增長，Circle Seal Controls 日趨壯大。

　　如今，Circle Seal Controls 生產製造多種規格的控制閥門及控制器，向工業儀表領域、原始設備製造商、航空航天及軍事領域提供專業產品和服務。經過50多年的發展，Circle Seal Controls 在高品質單向閥、放卸閥、電磁閥、減壓閥、閥組，以及儀表控制閥門等產品領域建立了領先地位。同時，Circle Seal Controls 在工程、製造、質量控制、市場推介等領域向用戶提供支持以協助用戶在新應用方面的設計和製造。

產品包括：
Check Valves止回閥/單向閥
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壓力調節器
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安全閥
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手動截止閥
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高壓電磁閥
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).