Kromschroder Gas pressure regulator valve VAD350R/NW-100A 88000270

The Kromschroder VAD350R/NW-100A is a servo-operated gas pressure regulator valve with a nominal diameter of 50 mm and Rp internal thread connection. It maintains outlet pressure within a range of 35–100 mbar, with a maximum inlet pressure of 500 mbar. The valve features a closing time of ≤1 second, IP65 ingress protection, and includes pressure test points, a position indicator, and a M20 cable gland. It is certified to EC, FM, CSA, and UL standards and is suitable for atmospheric and forced-draft burners. This regulator operates without an electrical coil, using a diaphragm and spring mechanism for precise pressure control.

When selecting a replacement pressure regulator of this type, confirm the connection size and thread type (e.g., Rp threaded) to match the existing gas train. Verify the required outlet pressure range and maximum inlet pressure to ensure the spring range and valve rating are compatible. Check the valve classification and certifications needed for your application. Ensure the regulator is installed downstream of the filter and upstream of the main gas valves, with proper orientation and access for pressure test points.

Common failures include diaphragm leakage, seized adjustment mechanisms, and drifting outlet pressure due to debris or wear. Symptoms may include unstable burner flame, inability to maintain set pressure, or gas leakage. Check the diaphragm for tears, inspect the adjustment mechanism for smooth operation, and clean any debris from the valve internals.