Pressure Sustaining/Check Feature Valves Model 1200-18

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Sierra Engineering & Manufacturing

Cairo, Egypt

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The model 1200-18 Pressure Sustaining Valve with Check Feature is a hydraulically operated, diaphragm-actuated automatic control valve. When installed in-line, they sustain minimum back pressure thus prioritizing pressure zones, preventing line emptying, and pump overload

                                                            Product Range
                                                            DN50 – DN1000
                                                        
                                                            Pressure Rating
                                                            PN10, PN16 and 25
                                                        
                                                            Temperature Range
                                                            -20°C TO +70°C
                                                        
                                                            Flange Dimensions
                                                            EN1092-2 (DIN2501)
                                                        
                                                            Hydrostatic Testing
                                                            EN12266, ISO5208
                                                        
                                                            Type Testing
                                                            EN1074-5
                                                        
                                                            Actuation
                                                            Hydraulically actuated
                                                        
                                                            Certificates
                                                            Manufactured under a certified ISO 9001 quality system

Water pipelines and distribution networks
Irrigation pipelines and networks
Ground reservoirs and elevated tanks
Pumping Stations
Water hammer systems
Water treatment plant

The primary benefit of using a hydraulically actuated valve is the use of line pressure as motive power to operate. Whether used to control pressure, flow, or level, these valves operate without the need for external pressures and/or electricity.
The hydraulically operated, diaphragm-actuated, globe valves consist of three major components: body with SS316 seat, special reinforced diaphragm assembly, and cover with bearing installed. The only moving part is the diaphragm assembly guided top and bottom by a precision machined stem. The nylon fabric-reinforced synthetic rubber diaphragm provides superior sensitivity and control for all applications.
The hydraulically operated, diaphragm-actuated control valves are closed-loop systems. The main valve is controlled by a pilot that compares its spring setting (set-point) to the process variable (ie. pressure, flow, and/or level). As the process variable changes, the pilot senses the change and compensates to keep the process variable as close to the desired set point as possible. As such, these valves are single set-point control valves, and a set-point change will require operators to change the spring setting of the pilot.
The valve body is made of ductile iron, withstanding both high hydraulic and mechanical stress.
The valve is equipped with a 316 stainless steel seat, it maintains excellent durability against erosion and ensures a drop-tight sealing.