Articles by ValveBuyer

Relief Valves

January 21, 2015 // 0 Comments

Relief valves Most fluid power systems are designed to operate within a preset pressure range. This range is a function of the forces the actuators in the system must generate to do the required work. Without controlling or limiting these forces, the fluid power components (and expensive equipment) could be damaged. Relief valves avoid this hazard. They are the safeguards which limit maximum pressure in a system by diverting excess oil when pressures get too high. Cracking pressure and pressure override —The pressure at which a relief valve first opens to allow fluid to flow through is known as cracking pressure. When the valve is bypassing its full rated flow, it is in a state of full-flow pressure. The difference between full-flow and cracking pressure is sometimes known as pressure differential, also known as pressure override. In some cases, this pressure override is not objectionable. However, it can be a disadvantage if it wastes power (because of the fluid lost through the valve before reaching the maximum setting). This can further permit maximum system pressure to exceed the ratings of other components. (To minimize override, use a pilot-operated relief valve.) Relief valves are either direct-acting or pilot-operated. Bypass Valves Act as [...]

What Does a Pressure Control Valve Do?

January 19, 2015 // 0 Comments

What Does a Pressure Control Valve Do? Pressure-control valves are found in virtually every hydraulic system, and they assist in a variety of functions, from keeping system pressures safely below a desired upper limit to maintaining a set pressure in part of a circuit. Types include relief, reducing, sequence, counterbalance, and unloading. All of these are normally closed valves, except for reducing valves, which are normally open. For most of these valves, a restriction is necessary to produce the required pressure control. When used in tandem with a pump, a pressure control valve provides more accurate control over the pressure supplied by the pump. Generally, pressure control valves can be used in the following 2 ways, depending on the application: 1) Pressure Control A pressure control valve can be used to maintain constant pressure, after the pump, for exact flow rates under a variety of conditions. For instance: unrestricted flow, with varying positive or negative pressure on the inlet side, or varying downstream pressure. 2) Bypass Valve A pressure control valve can serve as a safety device for protection of a system’s pump, motor, tubing and connections, vessels and other accessories. Installed as a bypass valve, it prevents excessive pressure [...]

Check Valves

September 17, 2014 // 0 Comments

A check valve, clack valve, non-return valve or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction. Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various types of check valves used in a wide variety of applications. Check valves are often part of common household items. Although they are available in a wide range of sizes and costs, check valves generally are very small, simple, or inexpensive. Check valves work automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem. The bodies (external shells) of most check valves are made of plastic or metal. An important concept in check valves is the cracking pressure which is the minimum upstream pressure at which the valve will operate. Typically the check valve is designed for and can therefore be specified for a specific cracking pressure.   Industrial processes Check valves are used in many fluid systems such as those in chemical and power plants, and in many other industrial [...]

Flowseal High Performance Butterfly Valves

August 25, 2014 // 0 Comments

Flowseal® High Performance Butterfly Valves are a standard in many industries including heating, ventilating and air conditioning, power generation, hydrocarbon processing, water and waste water treatment, and marine and commercial shipbuilding. Flowseal Valves are installed in diverse applications such as food and beverage processing, snowmaking and pulp and paper production. Flowseal Valves are available for harsh conditions and for applications requiring nominal pressure and temperature ratings. Flowseal high performance butterfly valves are available: in sizes from 2″ – 48″ in ASME pressure classes 150, 300, and 600 and are available with a diverse range of actuation options. Flowseal is a leading provider of soft seat, metal seat and fire-safe high performance butterfly valves. Our products are manufactured under an ISO 9001 Quality Assurance Program that assures each valve we produce meets or exceeds your application requirements. Additionally, our Design and Manufacturing facility is certified to the Pressure Equipment Directive (PED), and Flowseal valves can be ordered as CE marked (see page 23). Flowseal high performance butterfly valves are a standard in many industries including heating, ventilating and air conditioning, power generation, hydrocarbon processing, water and waste water treatment, and marine and commercial shipbuilding. Our products are also installed in applications as diverse [...]

Rotary Valves

August 20, 2014 // 0 Comments

Rotary Valves When capacity and performance are the requirements rotary valves are the answer.  Popular rotary products include butterfly, eccentric plug, full bore pipeline, high performance butterfly and segmented ball. Eccentric Plug Valves The eccentric plug rotary control valve features an eccentrically mounted plug or ball, which combines rotary valve efficiency with globe valve ruggedness. Full Bore Pipeline Ball Valves Full- or reduced-bore ball valves provide a solution for throttling and severe service applications in gas transmission lines, gas distribution, or liquid pipelines. High Performance Butterfly Valves Fisher High Performance Butterfly Valves feature an eccentrically mounted disc and are known for their wide application range and shutoff capability. Segmented Ball Valves Vee-Ball is a segmented ball valve which features a patented contoured segmented V-notch [...]

What Is A Ball Valve?

August 18, 2014 // 0 Comments

A ball valve is a valve with a spherical disc, the part of the valve which controls the flow through it. The sphere has a hole, or port, through the middle so that when the port is in line with both ends of the valve, flow will occur. When the valve is closed, the hole is perpendicular to the ends of the valve, and flow is blocked. The handle or lever will be inline with the port position letting you “see” the valve’s position. The ball valve, along with the butterfly valve and plug valve, are part of the family of quarter turn valves. Ball valves are durable and usually work to achieve perfect shutoff even after years of disuse. They are therefore an excellent choice for shutoff applications (and are often preferred to globe valves and gate valves for this purpose). They do not offer the fine control that may be necessary in throttling applications but are sometimes used for this purpose. Ball valves are used extensively in industrial applications because they are very versatile, supporting pressures up to 1000 bar and temperatures up to 752°F (500°C) depending on the ball valve design and material. Sizes typically range from 0.2 to 48 inches (0.5 cm to 121 cm). They are easy to repair and operate. The body of ball valves may [...]

Fisher Control Valves

August 15, 2014 // 0 Comments

Control valves are valves used in pipelines to control operating conditions such as flow, pressure, temperature, and liquid level by fully or partially opening or closing in response to a process signal. We have a large inventory of Fisher®, Baumann™, and POSI-SEAL™ brand control valves in stock. Rotary Valves When capacity and performance are the requirements rotary valves are the answer. Popular rotary products include butterfly, eccentric plug, full bore pipeline, high performance butterfly and segmented ball. Sanitary Valves Sanitary valves are designed to meet the stringent demands of today’s state-of-the-art Life Science facilities. Sliding Stem Valves Globe, angle, and 3-way valves offer a broad range–from DN15 to 600 (NPS 1/2 to 24) low-flow valves to DN 500 (NPS 20) and larger for demanding high-pressure steam and hydrocarbon [...]

ValveBuyer.com Has The Right Ball Valves

August 14, 2014 // 0 Comments

Having the right Ball Valve for the Job We have wide selection of  ball valves, available in bronze, brass, lead-free, carbon steel or stainless steel materials. Select the right ball valve in one-piece, two-piece, three-piece, full port, or conventional port. A range of trim material is available. The right end connections to choose from include press-to-connect, threaded, solder or flanged. To make your selection easier, call us today and our qualified staff will help you to make the proper selection.   Brass Ball Valves   Bronze Ball Valves   Carbon Steel Ball Valves   Gas Ball Valves   Medical Gas Valves   Plastic Ball Valves   Stainless Steel Ball [...]

ValveBuyer.com Service Oilfield and Petrochemical Markets

August 13, 2014 // 0 Comments

ValveBuyer.com is an organization that has been servicing suppliers in the oilfield and petrochemical markets since 1975. For nearly 30 years, we have provided outstanding service to all industries and markets. Valves, tubes, fittings, actuators, pumps, generators are all products that we provide. Combined with outstanding customer service, we have positioned ourselves as an industry leader in surplus valves and equipment. We placed ourselves between the manufacturers and the suppliers to have inventory on the shelf for all the emergency needs of the suppliers. The best position is when the manufacturer and the supplier consider ValveBuyer.com to be an extension of the factory, a partner, a supplier to help manufacturer (your company) meet all of its equipment needs. WEBSITE:  http://valvebuyer.com PHONE: [...]

We Buy And Sell Surplus Tube Fittings

August 11, 2014 // 0 Comments

Need quality instrumentation tube fittings at an affordable price? Give us the opportunity to exceed your expectations. In addition, we stock other major brands such as new pneumatic valves manufactured by Rexroth/WABCO, Sealco, and Bendix Westinghouse as well as clutches and rotorseals by Eaton Airflex. We have one of the largest new surplus Swagelok and Parker stainless valves and fittings inventory in the country. Our friendly staff is waiting to accept your call, fax, and/or email. Nationwide Service. Call Today. 1-800-759-6048 Give us a try! CUSTOMER SERVICE IS OUR PRIORITY! WE BUY & SELL NEW SURPLUS TUBE FITTINGS! We buy and sell products of these companies. Air Myte Bendix-Westinghouse Bosch Rexroth Brennan Deublin Fawick / Airflex, Div. of Eaton Corp. Hy-Lok Lenz Parker Rexroth (Formerly WABCO-FPD) Schrader-Bellows Sealco Superlok Swagelok Valvair Whitey [...]
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