Quality is everything! US Walker (WORK) imported electric steam control valve with electronic drive control device after, can regulate steam or hot and cold water flow, widely used with central air conditioning, heating, water treatment, industrial processing industry and other fluid control systems. Regulate the flow characteristics of the valve, is maintaining a constant differential pressure across the valve condition, the relationship between the medium flows through the valve of the relative flow with its opening. Control valve flow characteristics are linear features, such as the percentage characteristics and parabolic characteristic three. Meaning three fluence characteristics are as follows: 1, parabolic characteristics, flow is proportional to the change by the second stroke, with intermediate characteristics generally linear and equal percentage characteristics. 2 percentage equal percentage (logarithmic), and other relative stroke characteristics and relative percentage of traffic is not a linear relationship between changes in flow itinerary changes at each point in the stroke unit proportional to the flow caused by this point, the flow changes are equal. So it has the advantage of traffic hours, small flow changes, the flow is large, the flow changes, which is on a different opening, with the same regulation accuracy. 3, the linear characteristics (linearity), the relative stroke of the linear flow characteristics and a relatively linear relationship. Flow changes caused by the stroke unit of change is constant. Flow, the flow is relatively small change in the value, the flow rate of, the variation in the flow rate relative value. Technical parameters: Type: Single-seat pass-through casting ball valve Nominal Diameter: 20 25 32 40 50 65 80 100 125 150 200mm Nominal: PN1.6,4.0,6.4mpa use of materials: steel, cast stainless steel, and so on Bonnet: Standard -17 ~ + 230 ℃, cooling type + 230 ℃ ~ + 450 ℃, low temperature -60 ~ -196 ℃ bellows seal type -40 ~ + 350 ℃ gland type: Bolt Clamp packing: V-type PTFE packing, asbestos packing impregnated with PTFE, asbestos textile packing, graphite packing when ordering, please provide the following information:? a nominal diameter (mm), nominal pressure (MPa), operating temperature, and the range of 2 ??? Straight after the pressure regulating valve before the valve pressure of 3 media name and status at 4 single-seat control valve supply voltage (220V or 380V, default 220V) 5 Input signal:? 4-20mA, or 1-5V (default 4 -20mA) 6? single-seat control valve body, the trim material requirements 7? other special requirements (such as corrosion resistance requirements, proof grade requirements, leakage class limits, etc.) USA Walker (WORK) valve Chinese agents welcome your inquire and order!