{"product_id":"siebe-mk-6800-series-pneumatic-valve-actuator","title":"Siebe MK-6800 SERIES Pneumatic Valve Actuator","description":"\u003cdiv\u003e\u003cp\u003eSiebe MK-6800 Series Pneumatic Valve Actuator is a pre-owned proportional, linear pneumatic actuator designed to drive VB-series globe valves in HVAC and industrial control applications. It uses compressed air to position valve stems with proportional control and features a 50 square inch piston area, enabling robust actuation for typical valve trims; a linkage kit is included to connect the actuator to the valve stem. The unit uses a standard 1\/4 inch NPT air inlet and is available in several MK-6800 variants, including spring-return configurations; for example, the MK-6821 variant specifies 8-13 PSIG actuation with spring return and linear motion. This actuator family is documented as compatible with VB valve families (VB-11 and VB-9XXX series) and is referenced in Schneider Electric\/Invensys product literature, including linkage interfaces. The MK-6800 lineage traces through Schneider Electric’s data sheets and catalogs, connecting to legacy Barber Colman\/MK actuation components used in HVAC controls and process-valve assemblies. \u003c\/p\u003e\u003c\/div\u003e","brand":"Siebe","offers":[{"title":"Used Surplus - Excellent Condition","offer_id":46269165633770,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0716\/8039\/3450\/files\/GTG-STOCK-019.png?v=1788727428","url":"https:\/\/gtghardware.com\/products\/siebe-mk-6800-series-pneumatic-valve-actuator","provider":"GTG Hardware","version":"1.0","type":"link"}