Valves are never installed alone. Automatic Flow Limiting valves, Manual Balance Valves and Actuated Valves are all installed in HVAC systems with other valves and accessories. For example, most coil manufacturers and control valve manufacturers recommend strainers are installed before their equipment. Most building owners require that isolation valves are installed on mains and branches to make maintenance on equipment easier. Instead of sourcing all the accessory valves from different suppliers, Griswold Controls has sourced piping components and accessories to meet all your needs.