{"product_id":"parker-521811000-4-way-3-position-valve-lever-spring-return","title":"Parker 521811000 4-way 3-position Valve Lever-spring Return","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe PARKER 521811000 is a 4-way, 3-position mechanically operated directional control valve with a lever-spring return actuator. It is designed for pneumatic or hydraulic circuit control applications where a lever-actuated, spring-centered valve is required to direct flow through multiple ports. The valve features a closed-center (CC) configuration in the neutral position, 1\/4 inch NPT inlet and outlet connections, a Cv rating of 0.83, and a maximum working pressure of 150 psi. It is installed by fluid power technicians and industrial maintenance professionals in machinery, automation equipment, and process control systems.\u003c\/p\u003e\u003cp\u003eThis valve is suited for use in industrial and light commercial applications requiring manual directional control of a fluid or pneumatic circuit. The lever actuator allows the operator to shift the valve between positions, while the spring return automatically returns the spool to the closed-center neutral position upon release. Typical installations include pneumatic actuator control, cylinder sequencing, and directional flow switching in compact manifold or inline configurations using standard 1\/4 inch NPT ported plumbing.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e4-way, 3-position closed-center (CC) valve design with 5 ports for directional flow control\u003c\/li\u003e\n\u003cli\u003eLever actuator with spring return automatically recenters spool when released\u003c\/li\u003e\n\u003cli\u003e1\/4 inch NPT inlet and outlet connections for standard threaded pipe installation\u003c\/li\u003e\n\u003cli\u003eCv rating of 0.83 for predictable flow performance in low-flow circuit sizing\u003c\/li\u003e\n\u003cli\u003eOperating pressure range of 0 to 150 psi suits a wide range of pneumatic and low-pressure hydraulic applications\u003c\/li\u003e\n\u003cli\u003eWorking temperature range of 32 to 175 degrees F for standard indoor industrial environments\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style or replacement mechanically operated directional control valve for industrial pneumatic and fluid power systems using 1\/4 inch NPT ported connections and requiring a 4-way, 3-position closed-center spool configuration.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified fluid power technician or industrial maintenance professional. De-energize and depressurize the system fully before removing any existing valve or making new connections. Ensure all NPT threads are sealed with an appropriate thread sealant rated for the system media and pressure. Verify that the replacement valve spool configuration and port assignments match the existing circuit schematic before returning the system to service.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Design\u003c\/strong\u003e: 4-Way, 3-Position Closed-Center (CC)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActuator Type\u003c\/strong\u003e: Lever-Spring Return\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReturn Type\u003c\/strong\u003e: Spring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Positions\u003c\/strong\u003e: 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Ports\u003c\/strong\u003e: 5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInlet Size\u003c\/strong\u003e: 1\/4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutlet Size\u003c\/strong\u003e: 1\/4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Type\u003c\/strong\u003e: NPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCv Rating\u003c\/strong\u003e: 0.83\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum Working Pressure\u003c\/strong\u003e: 0 psi\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Working Pressure\u003c\/strong\u003e: 150 psi\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum Working Temperature\u003c\/strong\u003e: 32 degrees F (0 degrees C)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Working Temperature\u003c\/strong\u003e: 175 degrees F (80 degrees C)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 2 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: PARKER\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 521811000\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PARKER","offers":[{"title":"Default Title","offer_id":51544465047858,"sku":"521811000","price":421.08,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/304b74e9169653900459c592aaf0727a.jpg?v=1785927219","url":"https:\/\/voomisupply.com\/products\/parker-521811000-4-way-3-position-valve-lever-spring-return","provider":"Voomi Supply","version":"1.0","type":"link"}