For the power industry

Eurad advises and supplies according to your specified requirements the most applicable valve when it means:

• controlling cooling water flows in pipelines and pumping stations
• blocking cooling water flows in pipelines and pumping stations
• preventing backflow in cooling water flow in pipelines and pumping stations
• avoiding or limiting upsurge pressure or downsurge pressure peaks caused by spontaneous pumpstop in cooling water pipelines and pumping stations
• lowering pressure loss by venting air from cooling water pipelines and pumping stations
• controlling of process gas and process liquid flows in discharge pipelines
• blocking of process gas and process liquid flows in discharge pipelines
• preventing backflow of process gas and process liquid flows in discharge pipelines

COOLING WATER

Controlling cooling water flows: with the choice of the appropriate control valves, the risk of generating cavitation can be reduced. As a result the fault free operation time can be increased and maintenance costs can be reduced.

Blocking cooling water flows: with the choice of the correct block valves the fault free operation time can be increased and the operation costs will be reduced. With an extra feature to block the valve in the closed position it is allowed by the authorities to carry out (maintenance) activities behind the blocked valve with the upstream pipeline under pressure. For underground positioned or high positioned blockvalves Eurad advises in relation to the high assembly and removal costs to choose for the best valve designs.

Prevention backflow of cooling water flows: with the choice of the appropriate check valves, the generation of unacceptable pressure or vacuum peaks - due to incorrect check valve closing after a spontaneous pump stop - will be avoided. With more pumps parallel running a proper closing of the check valve after a spontaneous pumpstop is of enormous importance to avoid waterhammer.
Our advise is to specify a check valve that follows the decrease in flow immediately and will be closed at Q_positive = 0. If this cannot be reached in your project or by your choice of the check valve, a controlled and quiet closing of the check valve can be achieved by controlling the valve closing by means of an adjustable external mounted hydraulic brake unit. Eurad can advise in this and can supply the optimal functioning check valve.

Avoiding or limiting upsurge pressure or downsurge pressure peaks caused by spontaneous pump stop: besides doing this by the choice of the appropriate check valve it is possible to supply an extra protection against an unacceptable increase in pressure in the pipeline by fitting a pressure relief valve in the pipeline system. This safety protects the discharge pipeline against an overpressure caused by waterhammer by opening at an overpressure of e.g. 1.2 times the working pressure.
The protection of the discharge pipeline against too deep vacuum conditions can be achieved by installing an appropriate airvalve to supply air into the pipeline. One can choose to supply air into the system only at a certain vacuum value of e.g. minus 3 meters Wc. Eurad has the assistance of a number of waterhammer calculating specialists and can together with them advice accordingly.

Lowering pressure loss by venting air: except cleaning the pipeline and avoiding the entry of air into the system, the decrease in pressure loss in the discharge pipeline can be reached by mounting at the right place and in the correct way sufficient air release valves. We advise air valves venting air continuously under each operating pressure without aerating the system at vacuum conditions. Eurad has access to decades of experience in this application and can give you the best advice.

PROCESS GASSES AND PROCESS LIQUIDS

Controlling process gas and process liquid flows: with the choice of the appropriate control valves the risk of generating cavitation can be reduced. Control valves in steam, flue- and flaregas are preferably offered with the main shaft bearings positioned after the stuffingbox shaftsealing seen from the center of the valve. Eurad likes to advise.

Blocking of process gas and process liquid flows: the choice of the correct block valves will increase a troublefree operation and can decrease maintenance costs. Valves in steam, flue- and flaregas are preferably offered with the main shaft bearings positioned after the stuffingbox sealing seen from the center of the valve. Eurad likes to advise.

Preventing backflow of process gas and process liquid flows: the choice of non-return valves with a short closing stroke and a small mass inertia valve disc can result in a very short closing time. This will be the safest way to avoid medium backflow. Within Eurad we have the knowledge and expertise to offer the appropriate checkvalve.

AN OVERVIEW OF APPLICABLE EURAD INDUSTRIAL VALVES

For use in cooling water:

• Throttle valves and dampers - centric mounted mainshaft in many different designs
• Butterfly valves - double-eccentric mounted mainshaft. Valve disc with changeable rubber valve discseal
• Butterfly valves - double-eccentric mounted mainshaft with internal hard rubberlined body. Valve with changeable rubber valve discseal.
• Check valves - in several versions with rubber valve disc seal
• Check valves - with internal hard rubberlined body. Valve with changeable rubber valve disc seal.
• Check valves - in many designs with i.e. closed at Q_positive = 0
• Overpressure protection valves
• Vents and aerators

For the application in process gas and process liquids and steam:

• Throttle valves and dampers - centrically mounted mainshaft. Many different designs
• Butterfly Valves - total metal to metal valve disc sealingsystem
• Check Valves - Tri-centrically mounted mainshaft. In a total metal to metal valve disc sealing system