AST S.p.A. products

AST type SMU-7000 is a high capacity spring loaded safety relief valves designed to guarantee reliable and high quality overpressure protection for air, gas, steam, vapor, liquid and two phase applications. The rugged and standardized design make them suitable for the process and power industries and for the most critical applications. Wide range of accessories and exotic materials are available for the spring loaded safety valves type SMU-7000. Customized solutions such as forged block body, high pressure applications, flushing nozzles, heating jacket, special connections in accordance to the licensor specification etc are available to better suit the specific process condition specified by the Customer.

AST type SU-7000 is a spring loaded safety relief valves designed to guarantees reliable and high quality overpressure protection for air, gas, steam, vapor, liquid and two phase applications. AST type SU-7000 are made with an integral flanged casted body, the flanges are never screwed nor welded to the body. They are the ideal choice for all the critical applications where the high quality level together with the compact size are required. A wide range of material selection is available to suit the specific process conditions specified by the customer.
AST type SU-7000 spring loaded safety valves offer simple and reliable design that guarantees optimum maintenance life cycle costs.

AST type SMFN-7000 and SMF-7000 are spring loaded safety relief valves designed to guarantee reliable and high quality overpressure protection for air, gas, steam, vapor, liquid and two phase applications. AST type SMFN-7000 and SMF-7000 spring loaded safety valves offer simple and reliable design that guarantees optimum maintenance life cycle costs. Their versatile design includes screwed or socket weld connections. The high quality level, together with the superior tightness, makes AST type SMFN-7000 and SMF-7000 suitable even for the most critical applications.

AST type SMS-7100 is a high capacity safety valve specifically designed for steam service. These safety valves are usually installed on steam power boiler for overpressure protection. The double rings design allows for relieving capacity at 3% overpressure and for a precise control of valve closing. Maintenance resources and repair times are minimized thanks to the superior tightness provided by the specific flexible seat design of the disc. SMS-7100 safety valves are available either with flanged or welding neck inlet connection.

AST type SVP-7200 is a high capacity, full nozzle pilot operated safety relief valves designed to guarantee reliable and high quality overpressure protection for air, gas, steam, vapor, liquid and two phase applications. Modulating and on-off pilots are available. Thanks to the minimum flow through the pilot, guaranteed by the no-flowing design, AST pilot operated safety valves are suitable for cryogenic service. For an increased flow capacity full bore pilot operated safety valves are available. Wide range of accessories and exotic materials are available for the pilot operated safety valves type SVP-7200. Soft seats or metal to metal seats, with superior tightness performance, are available. Customized solutions with special connections, in accordance with the licensor specification, and high pressure applications that exceed API 526 limits are available.

Main features: AST produces a complete series of control valves with electric or pneumatic spring-diaphragm actuators. Materials: carbon steel, alloy steel, hastelloy, monel and other materials upon request. Accessories: handwheels (side and top mounted), stem bellows for bubble tight sealing, pneumatic, electropneumatic or digital positioners, filters, boosters, lockup valve etc.

Main features: Specially designed for critical service applications, where higher performances than conventional contoured plug, screwed seat valves are required, CV-8450 (straight way body) & CV-8750 (angle body) series valves feature a cage based robust, simple and reliable design with a wide range of anti-noise, anti-cavitation and velocity-controlling trims for heavy-duty applications. All valves have quick change design with seat locked by the drilled cage also guiding the plug for the whole stroke, realizing flow control and allowing plug balancing to reduce actuating forces. The trim design, with internal thermal differential compensation system, allows to extend working temperatures from -55 °C (-196 °C for the cryogenic series) up to 566 °C. A large number of plug balancing solutions allows to reach highest sealing classes in the whole range of operating temperature with reduced actuating forces.

Valve Series CV-870U & CV-870S were specifically developed to satisfy the high reliability and the best performance required in urea and melamine plants; experience gained in the field, fluid-dynamic feature optimization and the use of specific materials allow the obtaining of high resistance to erosion and to corrosion in presence of particularly aggressive process fluids even at high pressure and temperature values. Our valve design also takes into consideration easy assembly and disassembly of internal parts to facilitate maintenance operations. Upon request, valves can be provided with electrically traced jackets or jackets with diathermic fluids to heat valve body at the required temperature. Flushing ports are often provided to clean valve trim, in order to avoid crystallization and deposit, granting superior reliability. The actuator and instrumentation provided with the valve are carefully selected and calibrated to ensure the best control performance. 

AST RV-6000 changeover valves are three-way devices for flow selection in a pipeline, typically used to connect two safety valves to a single pressurized system. These devices ensure the possibility to have one safety valve always in operation and one in “stand-by”, ready to come into operation. These changeover valves are recommended to increase plant availability or to avoid plant shutdown, avoiding any relevant economic damage. RV-6000 changeover valves can be installed individually upstream of the safety valves or upstream and downstream of the safety valves, when outlet is connected to a closed header. If inlet and outlet changeover valves are used, a mechanical interlocking system prevents human error during the operation. Our simple design allows easy assembly / disassembly; easy removable seats allow quick and economic maintenance. These valves are suitable for a wide range of applications, such as high temperatures, cryogenic service, lethal fluids and many others.