Carly Wood Valves April 20th, 2019 - 12:49:15
With the advent of the market brass ball valves, they immediately appreciated was evaluated, and the demand for these products increases, as well as their scope. Now such products can be found in any economic stall. However, despite their apparent similarity, not all ball valves are really reliable and durable. Along with high-quality Italian taps, more and more pushed over in the trade cheap Polish, Chinese and Turkish valves, whose quality is far from perfect? In the struggle for the vast US market, some sellers have begun to distribute cheap "consumer goods" for branded products, quite simply to sell a fake, so I'd like to give some practical advice to buyers' brass ball valves. As a rule, forgery in performance is much inferior to the original products. Their use in water and heating systems can lead to accidents and big material losses. Counterfeits can cause serious damage and human health.
It is useful to say how counterfeit valves masquerading as the original. One of the techniques - misspelling the names of famous companies, such as, Bogati instead of Matca-Norca. Formally, this is not fake, because the original brand is not used. There are cases of writing only the names of countries, for example, USA, instead of adopting a made in Italy. The distortion of the famous logo, placing it, for example, not a diamond, but a square or a circle, also serves to confuse the buyer. Evidence of fraud may be the absence of any of the markings required for specific manufacturers. The sale of gas valves, and found such a primitive form of deception, as replacement faucet handles on native yellow - gas (gas valves are more expensive). Price savings may be too high, so choose the ball valves are safer from the range of recognized brands.
In order to achieve the best performance of valves, manufactures must take many important design factors into consideration. These factors include actuator or positioner design, valve response time, valve type and sizing, and dead band.
These examples of Swagelok Valves give the customer great insight into the care, detail, quality, design and testing that goes into the manufacture of each and every Valve in the Swagelok catalogue. It's easy to see why Swagelok has no hesitation in backing their products with the Swagelok Limited Lifetime Warranty.
Valve response time is another important factor for us to consider. For optimum control of many processes, it is important that the valve reach a specific position quickly. A quick response to small signal changes is one of the most important factors in providing optimum process control. Valve response time includes both the valve assembly dead time, which is a static time, and the dynamic time of the valve assembly. It is important to keep the dead time as small as possible. Dead band, whether it comes from friction in the valve body and actuator or from the positioner, can significantly affect the dead time of the valve assembly.
Swagelok produces a variety of Check Valves to meet every need. All Check Valves are factory tested for crack and reseal performance with a liquid leak detector. Check Valves with fixed cracking pressures are cycled six times prior to testing. Every valve is tested to ensure it seals within 5 s at the appropriate reseal pressure. Check Valves with adjustable cracking pressures are tested at two pressure points. Every Valve is tested at a low-pressure setting and at a high-pressure setting, and all must seal within 5 s at the appropriate reseal pressure.