Combined Check Valve

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Sierra Engineering & Manufacturing

Cairo, Egypt

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Combined Check Valves or Hydraulic actuators weight-loaded HAWL valves are used at all critical areas where the pipelines must be reliable, immediate, and controlled quickly for valve closing, e.g. in case of external power loss, cutting off electricity cables during earthquakes, or disasters In a system, ruptured pipelines, etc.) While the valve closing is used the potential energy of the lifted weight is. The counterweight and lift cylinder shut-off valve are used to stop the water on the pipelines automatically. The pipeline shut-off function must be guaranteed under the hardest of maximum flow rates or pressure and in case of electric power failure. The movement of the shut-off device ( ball valve, needle valve) is guaranteed by means of a hydraulic actuator composed of a hydraulic cylinder to maintain the valve open and a counterweight to close the valve.

                                                            Product Range
                                                            DN500 – DN1800
                                                        
                                                            Pressure Rating
                                                            PN10, PN16 and 25
                                                        
                                                            Temperature Range
                                                            -20°C TO +70°C
                                                        
                                                            Flange Dimensions
                                                            EN1092-2 (DIN2501)
                                                        
                                                            Hydrostatic Testing
                                                            EN12266, ISO5208
                                                        
                                                            Type Testing
                                                            EN1074-3
                                                        
                                                            Actuation
                                                            Compact electro – hydraulic power unit type with Tank
                                                        
                                                            Certificates
                                                            Manufactured under a certified ISO 9001 quality system

Anywhere to shut down flow quickly and reliably
Reinforcement of protection of the turbines and pumps
Ensuring a ruptured pipeline through an additional electro-hydraulic device connected to actuator HAWL

Main Product Features

Hydraulic actuator with weight, quickly and reliably closes the valve, butterfly, ball, and control valve
A modular concept, compact design, and standard attachment by ISO 5211 allows assembly quick and easy on the valve, HYDROMAT® system “plug, and play”
Especially bearing of the lever with the weight is performed so inside the actuator housing that two bearing seats only transmit torque and no additional burdens to the valve shaft, providing a simple and easy assembly
Actuator is standard equipped with its own hydro power unit for autonomous operations, or can be used as an external source of hydraulic fluid pressure from 70-250 bar
The actuator with its own hydro-aggregate is used for opening and automatic keeping open the valve position Standardly is used very reliable compact electro-hydraulic power units type CEHPU design enables seamless functionality in a working environment temperature -40/+80 º Special request and design of hydropower pack (carbon steel, stainless steel…) or different pneumo-hydraulic combinations
On request offered is also a special version of power units: pneumatic, pneumo-hydraulic, etc… (see a separate catalog for the hydraulic power units)
All versions of actuators are equipped with a hand pump in case of emergency forcible valve opening
The structure was constructed with a lot of attention to respecting the regulations on environmental protection and the prevention of contamination with mineral oil
Weight and lever are made separately (modular concept), and simple installation can be easily incorporated into an individual approach to solving the specific operating conditions.
The standard version is performed with 2 adjustable end position micro-switch (protection IP65) for detection of valve openness and closing
On special request, the actuator can be equipped with a rotary encoder (4-20 mA) position or additional microswitches
The intelligent design of the valves with suitable sensors for closing or opening controlling flow and pressure
The standard version has an adjustable 2 damping stages for the closing process. On request is performed in 3 stages damping with activation in any position closing process
Automatic safety shut off, as a standard, offers the possibility to connect a reliable device (paddle trip mechanism) for detecting and triggering the flow over speed, eg, a ruptured pipeline.
The concept of electro-hydraulic control system NO (normally open) or NC (normally closed)
With fixed mechanical limiters can be adjusted to closed position ± 3%
With self-aligning clevis with its (un) tightening can be adjusted open position ± 3%
Adjustable the valve opening and closing time with flow control valve pressure compensated with security function
Using a “service pin” is possible to “lock” the valve at the open and close position in a case of service works as a safety
Actuators type HAWL designed: max operation pressure 160 bar, test pressure 250 bar