Priming Valves and Options

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Siemens Water Technologies Corp. retained Lynn Engineered Systems to consult on problems they were encountering in achieving the design filtrate flow capacities for the siphon driven membrane filtration system at the Carter Lake North Water Treatment facility. ...more

 
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Automatic Tank Drain

Automatic Tank Drain
This assembly provides the ultimate protection against priming system shut-down due to water build-up in the receiver. For remote installation and when equipment can't be monitored on a regular daily basis, this is an absolute must. ...more

Purge Control
Automatic Purge Control offers the ultimate vacuum pump protection against moisture build-up in the oil. It reduces maintenance and frequency of oil changes and helps maintain the vacuum pump in peak performance.

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Priming Valves

Priming valves serve as a means to isolate the water side from the vacuum side of a pressure controlled priming application. The basic priming valve is a normally open valve that closes with the rise of water into the valve. Closure of the valve is achieved through a positive linkage connection between a ball float and the discharge seat. With a vacuum applied to the exhaust side of the priming valve, water will rise from the source up into the priming valve through the connected suction side piping. As the water level rises in the priming valve the float also rises and closes against the seat. Thus isolating water from flooding into the vacuum (or dry) side of the process.

 

Priming valves are available in several sizes to meet the flow requirements of the application and can even combined when high flow is required. Priming valves can be furnished with several options to further enhance their function or meet project requirements. Some of the typical features provided include:

  • Water Level Control Switch - this feature provides the local priming valve with "proof of prime" indication that can be interlocked with the start-up of the connected centrifugal pump. Additionally it can also provide remote annunciation of the prime status.
  • Duplex Priming Valves - for increased flow handling capacity for use with large pumps or faster priming, two priming valves can be furnished as duplex assembly.
  • Back Flushing - accessories can be added to priming valves handling sewage or other unfiltered solids. This feature includes isolation valves and quick disconnect hose couplings so that valve cleaning can be done quickly without system shutdown.
  • Isolation Valves - isolation between the suction and vacuum sides is essential for system operation and control. These valves can be factory installed so they don't get forgotten in the field.
  • Connections - valves can be furnished with special end fittings to mate with existing or preferred type field fitting.

 

Above pictures are of typically furnished priming valves. On the left is a 2" valve with water level control feature and 316 SS suction & vacuum isolation valves. Photo on the right is a high flow duplex valve with 316 SS suction & vacuum isolation valves.

 

When designing large capacity systems it is necessary to consider how the priming system will be isolated from the water side of the process. Typical priming valves cannot handle the flow capacity requirements of large applications. Design options are available including the pneumatically isolated, level controlled chamber shown here. Designs such as this provide controlled isolation between the water and vacuum sides of the process without restricting the flow. Local controls are provided for operation independent of the vacuum priming system.

 

 

 

 

 

 

 

 

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