Abacus Valves International is a UK-based manufacturer of wafer check valves that has been in business for over 25 years. It produces a wide range of precision-engineered check valves for various industries such as oil and gas, water and utilities, and pharmaceuticals. Abacus operates as part of the Glen Foundry Group along with two partner companies, Anderson Stewart Castings and Precision Tooling Services, which provide investment castings and machined components respectively.