The shut-off element of a resilient seated gate valve is a wedge-shaped gate coated with rubber, which rises and lowers when the valve stem is turned. Thanks to the rubber-coated gate, the valve is less sensitive to impurities between the gate and the sealing surface compared to traditional wedge gate valves.
The pressure resistance of a resilient seated gate valve is quite limited, so its typical applications include use as a shut-off valve in water pipelines. The materials used are cast irons and steels.
The valve’s competitive advantage is its relatively low acquisition cost. The body material is often cast iron. For oil applications, the same valve is available with gunmetal shut-off elements.
Selecting a resilient seated gate valve
Typically, a resilient seated gate valve is selected based on the line size, also taking into account the process medium’s pressure and temperature to ensure they do not exceed the valve’s allowable limits.
The resilient seated gate valve can also be installed underground, equipped with an extension spindle.
We assist in selecting and sizing a resilient seated gate valve that meets the requirements of the application.
Size classes: DN 15-500 Pressure classes: DIN PN 16-160, ANSI 150-2500 Materials: A105 (C22.8), WCB 1304, 316, 316T, Hastelloy B or C, titanium, duplex Seals: Pentafite (self-lubricating metal seal), stellite Operating temperatures: -148 °C…+800 °C Connection ends: between flanges, flanged, threaded, weld ends Other: several options for hard-coated balls Other designations: metal seated ball valve
What is a Metal Seated Ball Valve?
Metal seated ball valves are an excellent choice when a valve is required to have rapid operating capability and light weight, while also offering high temperature resistance.
Since process media come in many varieties and pressures combined with high temperatures can be very challenging, it is absolutely essential that the function and material of every individual component of the metal seated ball valve are carefully considered and selected.
Selection of the Metal Seated Ball Valve
An extensive range of pressure, temperature, and material options, along with the long experience of our equipment manufacturers, assists in selecting a cost-effective valve for different process applications.
Valves are available in 2-way versions for on/off operation and 3-way versions for diverting services. Antistatic properties comply with the BS 5146 standard and the construction with TA-Luft TÜV.
Our ball valves are available with manual, pneumatic or electric actuators.
PENTA Valves’ valves generally adhere to the Fire Safe EN ISO 10497 – API607 V test requirements. Antistatic properties, in turn, comply with the BS 5146 standard and TA-Luft TÜV.
In our program, you can find valves from manufacturers such as OMB Spa, PENTA Valves, and ARMATURY Group.
ARMATURY Group’s (AG) metal seated ball valve with a movable seal (see brochure) in size classes DN 200–1400 is supported in its design. It is ideally suited for consuming or small molecule media, because the ball and the seal do not slide against each other. When opening, the ball and the seal separate linearly before the ball rotates – the reverse occurs when closing. The seal surface is controlled by the actuator.
The seal is pulled away from the ball prior to operation, minimizing wear and operating torque. Once the valve is closed, the seal is pressed against the ball. The sealing force does not depend on the pressure difference, so the valve achieves full tightness even at very low pressure differences.
The valve is excellent for dry and difficult-to-seal gases, as the seal and the ball do not slide against each other and the sealing force is always high.
We assist in sizing and selecting the appropriate ball valve for each application.
Manually operated globe valves are durable shut-off valves. Their sealing element consists of a wedge-shaped disc that seals tightly against the seat. Globe valves cause a slight pressure drop in the pipeline, which is important to consider when selecting a valve. Globe valves open slowly, preventing pressure surges. Globe valves are categorized into packing-sealed and jacket-sealed valves.
The jacket seal is a kind of double safety measure in addition to the packing seal, preventing stem leakages and fugitive emissions. This is an excellent feature when considering valve maintenance requirements and the valve’s suitability for hazardous fluids such as hot oil, chlorine, or hydrofluoric acid. The jacket prevents process fluid from reaching the packing, making the valve more environmentally friendly and safer. The pull nut in the bonnet allows for the vertical movement of the stem (the stem does not rotate as in packing-sealed valves), so that the valve threads are protected from external contamination and corrosion.
Watch our webinar on globe valves.
Selection of the Manually Operated Globe Valve
When sizing a globe valve, it is important to know the process fluid, temperature, pressure, and the pressure differential across the valve.
Various material options are available, ranging from cast iron to acid-resistant steel and nickel alloys. Our product portfolio covers EN and ANSI valves for both low-pressure and high-pressure systems.
For Process Fluids
Our product range includes ARI-Armaturen’s globe valves available in welded versions with both EN and ASME flanged options. OMB specializes in small, compact shut-off valves, and our selection also includes special materials. For challenging fluids, we offer Descote globe valves in our portfolio.
When dealing with toxic or otherwise environmentally harmful fluids, it is important to pay attention to the fugitive emission level of the stem seal. A low-emission valve is both user and environmentally friendly. In addition, leakage emissions through the stem seal represent a loss of process fluid. Besides low-emission models with containment seals (ISO 15848, API 622, API 624), our range also includes jacket-sealed models for process conditions where it is crucial to ensure that process fluid does not escape into the environment through the containment seal.
For Steam and Condensate
The same general principles apply to globe valves suitable for steam and condensate as described above for process fluids. The brochures include, among others,
ARI FABA®-Plus jacket-sealed globe valves
ARI STOBU® packing-sealed globe valves
ARI FABA® -Supra I and C jacket-sealed globe valves
The offering is largely the same as for other process fluids.
For hydrocarbon applications, packing-sealed valves with low-emission packing are available. The stem seal is type-tested, for example, according to ISO 15848-1 or TA-Luft. In a jacket-sealed valve, the stem is additionally sealed with a welded metal jacket, which makes the packing pressure-free and the valve itself more responsive. No fugitive emissions occur through the stem seal of the jacket-sealed valve.
For Cryogenic Fluids
For cryogenic applications, the globe valve is made of materials that are resistant to cold, such as stainless steel. The cryo valve has an extended stem to ensure that the stem seal remains intact. The cryo valve must be clean and dry, as freezing water, for example, can damage the valve.
Globe valves are ideally suited for shut-off and control applications with cryogenic fluids. Due to their design, globe valves always incur a certain amount of flow resistance. The valve does not have an intermediate chamber where process fluid could become trapped.
Our product portfolio includes a wide range of shut-off, quick shut-off, and control globe valves for cryogenic applications from HEROSE and KÜHMEL.
