The ARCA angle style control valves Series 350 and 380 are proven under critical process conditions. If used in steam or process gas applications at high pressure and temperature, in cavitation-free relaxation of liquids at high pressure differential, or in handling of fluids with high solid contents, the modular system of valve housings, bonnet and trim styles, in combination with a large range of materials, always offer an ideal solution.
The combination of high pressure ratio and solid-containing fluids, such as those found in boiler feed water control for example, is one of the most critical challenges for sizing, selection and design of a control valve.
Due to the high pressure ratio, multi-stage valves are indispensable to avoid severe cavitation damage. However, as soon as the fluid contains solid particles, besides the normal fluid-dynamic sizing (determination of the number of throttling stages and their individual flow coefficient), the grain size of the particles has to be taken into account. The cross-section area of each flow channel in the valve must then be of the size and shape that will allow all particles in the fluid (assumed to be of spherical shape) to pass.
Since the cross sectional area of each throttling stage is explicitly defined by the flow coefficient calculated from the fluid-dynamic valve sizing, only the shape of the flow channel remains to be optimised.
It is obvious, that a circular shape is the optimum with regard to the permeability of spherical particles. ARCA’s newly developed multistage trim MS4 valves, which have only one flow channel in each stage, milled as a spherical calotte into a rigid, multiple guided control rod, approximates this ideal shape and is superior to a multistage parabolic plug design in this respect.
Another special feature of this trim style is the protection of the seating surface (which is the most sensitive area in terms of erosion) by over-stroke of the valve. The rigid multiple guidance of the control rod is an effective prevention against mechanical vibrations and resulting wear, even at extremely high pressure differentials.
Series 350 and 380 are available in sizes up to 10” (DN 250) and ratings up to Class 2500 (PN 400). Depending on the process conditions, MS4 trims can be delivered in valve sizes up to 4” (DN 100).
ENERGYValves expands operations
Valves, Actuators & Pump Control
ENERGYValves is expanding its operations with a new facility in Cape Town. The new premises will significantly enhance the company’s capacity to serve the Cape Town market and surrounding areas.
Read more...Pumps lead the way with advanced technology
Valves, Actuators & Pump Control
The KSB GIW MDX pump has consistently represented a major leap forward in mill duty applications, with KSB relying on customer feedback to improving the design continuously.
Read more...Wireless leak detection valve
Valves, Actuators & Pump Control
Designed to prevent water leakage by automatically shutting off the water supply when a leak is detected, the Runxin F104 wireless leak detection valve is one of the latest offerings from Allmech.
Read more...Ball valves and actuators optimise HVAC performance Schneider Electric South Africa
Valves, Actuators & Pump Control
Schneider Electric offers the full range of innovative SpaceLogic and EasyLogic ball valves and actuators. These cutting-edge products are designed to optimise HVAC system performance, ensuring comfort and energy efficiency in commercial and residential buildings.
Read more...Alfa Laval expands hygienic valve portfolio
Valves, Actuators & Pump Control
Alfa Laval is expanding its hygienic valve portfolio by introducing the Unique SSV pressure relief valve and the Leakage Detection butterfly valve, alongside new smaller sizes of the Unique Mixproof CIP and Unique Mixproof process valves.
Read more...Preparing pump systems for adverse weather conditions
Valves, Actuators & Pump Control
As the severity of storms in South Africa increases, so has the rush of sediment-laden water become a major issue and a significant challenge for irrigation. When sediment levels rise to just 10 grams per litre or more, the risk of pump wear and dam silting increases dramatically.
Read more...High-flow solenoid valve Emerson Automation Solutions
Valves, Actuators & Pump Control
Emerson has introduced the new ASCO Series 327C solenoid valve, which features a direct-acting, high-flow design that provides superior flow-to-power ratio. It permits high flows at minimum power levels, making it ideal for use in power plants, refineries, and chemical processing facilities.
Read more...Proportional cartridge valve series is the fastest in its class
Valves, Actuators & Pump Control
Parker Hannifin is introducing the enhanced version of the proportional cartridge throttle valve series, TFP. The new pilot valve further reduces the step response times by up to 30%, making the TFP the fastest valve in its class.
Read more...Proportional cartridge valve series is the fastest in its class
Valves, Actuators & Pump Control
Parker Hannifin is introducing the enhanced version of the proportional cartridge throttle valve series, TFP. The new pilot valve further reduces the step response times by up to 30%, making the TFP the fastest valve in its class.
Read more...Inspection system for leak detection in valves in hazardous areas Extech Safety Systems
Valves, Actuators & Pump Control
Leaking valves in industrial plants not only lead to loss, safety risks and possible contamination and pollution, but also result in high economic costs. Therefore, valves in hazardous areas require regular proper inspection and preventive maintenance to ensure their functionality.
While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.
printer friendly version