The Spence Type D34 water pressure reducing valve is adjustable, direct operated, packless, diaphragm actuated, balanced and single seated. The valve has a tight shutoff for dead end service and maintains a discharge pressure which will not vary more than 1 psig / 0.07 bar for each 10 psig / 0.70 bar inlet pressure variation. Delivery pressure variations from zero flow to rated flow do not exceed 15% of the maximum spring pressure rating. The valve is be suitable for 200°F / 93°C service temperature. Valve body is cast iron, sizes range from NPS 1 to 6 / DN 25 to 150, Size NPS 2-1/2 / DN 65 and larger have flanged ends. Trim is stainless steel to mitigate corrosion. Valve is equipped with reversible composition disc, diaphragms. All working parts are easily accessible without removal of valve from the line for ease of maintenance.
