The Maxton OSVE1 is an elevator safety shut off valve designed to protect against elevator car overspeed in the down direction due to supply line failure and car overload situations. The OSVE1 is used in low flow system applications (100gpm max, 379 l/min max). Use the Maxton valve calculator for valve sizing to the job specifications. The Maxton OSVE1 can be adjusted to stop the elevator in the event of an overspeed condition resulting in an abnormally high rate of flow between the OSVE1 valve and the power unit. Can be installed in a horizontal or vertical position. The Maxton OSVE1 complies with ASME A17.1/CSA B44 and meets (UFGS Division 14 Conveying Equip Section 14 24 00 Part 22.214.171.124) requiring a valve equipped with manufacturer's manual shut off feature. The use of this valve is required in areas of high level seismic activity IE: California. Check your local codes for compliance.