Priming Valves

Priming Valves

Simple, But Essential Components in Vacuum Pump Priming Systems.

A priming valve works according to a simple principle mastered thousands of years ago, but perfected by the best of today’s manufacturers of priming valves and similar equipment, such as compressors and vacuum pump priming systems. In short, a priming valve is merely a float mechanism that rises and falls in tandem with the level of a liquid inside the valve’s body. When there is no liquid in the body, the valve is considered to be in the open position. A passage is created from all inlet connections through to the vacuum outlet. In contrast, the priming valve is in the closed position when enough water has entered the body to cause the float to rise and close the passage.

Priming Valves

A very common scenario in a priming system design accommodates the accumulation of an air, gas and vapor mixture in the priming valve body, having risen through the liquid. The pressure of this mixture causes the liquid to vacate the body. The float drops as the level of the liquid decreases, which opens the valve and releases the mixture. As soon as this evacuation occurs, the pressure of the mixture no longer impedes the liquid, so it can re-enter the valve body. The float rises in unison with the liquid to the closed position.

The operation of a priming valve may be simple, but what industrial managers want is a dependable, durable valve that just keeps working. That’s exactly what Gardner Denver Nash, a subsidiary of Gardner Denver, delivers with its reputation for the very best in tough, always-on-duty priming valves. An example of this is in the GD Nash design, which contains no linkages to wear out and fail. For more than 100 years, GD Nash has been known for its design and manufacturing excellence in vacuum pump priming systems, as well as its ability to create solutions for many industrial challenges.

GD Nash priming valves are specifically designed to benefit the wise managers who choose them. Features include baffled flow paths for smooth, positive valve operation. In addition, the float is reversible, which doubles its working life. Finally, the priming value body is made from cast bronze to be more durable and resist corrosion.

Vacuum pumps, equipped with a priming valve, and totally engineered systems from GD Nash are driving the productivity of many industries today. A few examples include:

  • Composite plastic molding processes.
  • Production of most types of electric lamps, vacuum tubes and CRTs, especially if the product is either left empty or refilled with a specific gas or gas mixture.
  • Semiconductor processing, notably ion implantation, dry etch and PVD, ALD, PECVD and CVD deposition.
    • Medical processes that require suction.
  • Analytical instrumentation for gas, liquid, solid, surface and biomaterials.

A critical application of GD Nash technology is the priming of vacuum systems onboard passenger and cargo vessels. In this ready, or primed, status, the system can begin to pump almost immediately. Some ships may have more than one kind of water (gray or bilge, for example) that must be pumped by one vacuum system. In these cases, GD Nash offers a system engineered with dedicated priming valves, so the water types are serviced and kept totally separated.

Gardner Denver Nash is a global partner with companies around the world that rely on top-grade priming valves and compressors, vacuum pumps, liquid ring pumps and so much more. Manufacturing facilities are located in the United States, China, Germany and Brazil with Engineered-To-Order (ETO) centers in the United States, Singapore, Australia and Netherlands. The GD Nash record of service is just as outstanding as its design and manufacturing prowess. Its service centers are ISO 9001:2008 certified and are strategically positioned throughout the world in North America, England, Germany, Sweden, the Netherlands, Australia, Singapore, Korea, Brazil and South Africa. Stock parts and replacement pumps are shipped from distribution centers in North America, the Netherlands, Singapore and Brazil.