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Superior Turbine Tripping Reliability
The Elliott Pos-E-Stop 203 Trip Block is a technological leap forward in the control of trip valves for steam turbines, hot gas expanders and similar power applications in emergency situations such as overspeed, high vibration or process upset. The Pos-E-Stop Trip Block's flexible "two-out-of-three" logic provides a significantly higher degree of tripping reliability than single or paired solenoid designs, and its best in class response time reduces the tripping interval for enhanced safety. And, the Pos-E-Stop Trip Block has the ability to interface with the master plant control or EDS system.
Features and Benefits
- Improved trip system reliability
- Best in class response time with reduced tripping interval
- Increased availability
- On-line test capability without defeating trip protection
- On-line replacement of critical components without defeating trip protection
- Continuous on-line monitoring of solenoids and valve positions
- Elimination of isolation valves reduces risk of operator error
- Enables trip system standardization across the plant
- Easy to install; simplifies most piping layouts
- Meets hazardous area classifications
- Meets applicable CE directives
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The Internal Tank Valve is a fail safe isolation valve for bottom and side withdrawal tanks. It is sometimes refered to as an emergency tank shut off valve.
They are commonly installed in storage tanks that contain dangerous or flammable liquids or gases such as LNG, Chlorine, Propane, Propylene or Ammonia etc. In the event of an emergency the air supply provided by air actuators placed on the tank is interupted. A weight or a spring slams the inlying valve shut, securing the tank and it's contents.
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VSP safety valve
The over/under pressure VSP 273 Safety Valve has been engineered in order to protect silos and hoppers against occasional over - and under - pressures which can be generated by :
Pneumatic filling
Blockage of the vacuum cleaning filter
Fermentations
Variations in temperature
Condensation
The VSP 273 has been designed to only work on roof.
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Rupture discs and Safety valves may be used independently as primary safety devices or in conjunction.
Possible combinations are:
Disc and PSV in parallel: the disc is a second safety device in order to increase equipment safety (usually the rupture pressure of the disc is slightly above the setting of the valve). Typical application: liquefied gas tanks
Disc downstream a PSV in order to protect the PSV from corrosive chemicals present in the vent duct
Disc upstream a PSV: this solution allows combining the positive aspects of both devices: tightness of the disc and re-closure of the valve. In addition the discs protects the valve from corrosive or scaling process fluids, reducing the maintenance required by the more expensive and sensitive device. Main advantages are:
Protection of the valve from aggressive or scaling fluids
Avoid leakage due to valve scaling or corrosion (very important for dangerous fluids)
Reduce maintenance (cleaning, calibration)
Reduce the cost of the valve by using less expensive materials
Test the correct performance of the valve without plant shut-down and valve dismounting
The rupture pressure of the discs is the same of the setting of the valve; build up of pressure in the space between the disc and the valve must be monitored and avoided
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Sarasin RSBD manufactures and supplies a comprehensive range of pressure safety valves and safety devices. The variety of products covers all industrial applications in which protective action against overpressure is required.
Sebim Nuclear Valves
Sebim manufactures a wide range of nuclear safety relief valves and accessories. These products are used worldwide and adapted to individual customers’ specific requirements.
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Pressure relief valve
- Reliable
- Compact form
- Maintenance free
- Use of non corrosive materials
- Easy disassembling and inspection
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The ASTER ball valve, with full bore, is compact, flexible and easy for installing.
Blow-out proof system, with perfect air bubble sealing, does not need any maintenance, is equipped with wrapping seats ensuring long life cycles. The stem packing is composed of 3 seals: two o-rings for low pressure and an antifriction ring in PTFE for high pressure.
All valves are tested at 25 bar pressure, for a period longer than 48 hours.
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● Low Lift Safety Valves
● Material: Body-Cast Bronze, Valve Seat-Brass
● Orifice Size: 1/2"(15mm), 3/4"(20mm), 1"(25mm), 1¼"(32mm), 1½"(40mm), 2"(50mm)
● Working Pressure: 2~10 kgf/cm², 11~20kgf/cm²
● Working Temperature: -45~+185ºC
● Working Fluid: Noncorrosive gas, noncorrosive liquid, air, steam
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Safety Relief Valves
Size range : DN6 - DN20 1/4" - 3/4"
Pressure rating : Up to 44 BAR
End connections : Inlet screwed male, outlet screwed female
Configurations : Angle relief, thermal relief, in-line relief
Materials : Bronze, gunmetal, austenitic stainless steel on request
These valves are designed for the protection of static and road-going storage tanks against damaging over pressurisation.
There are three basic sizes defined by the throat diameter and these are available with a variety of inlet and outlet connections the valves are designed and factory set to lift repeatedly within +/- 2% of the set pressure, and to re-seat above 92% of set pressure. Spring pre-compression and blow-down ring settings are lead sealed after test to inhibit unauthorised tampering, as these products are a category four-safety product. During testing pre-delivery, flow rates at 10% above set pressure are measured to ensure compliance with stated flow capacities.
The valves can be supplied with appropriate positioned drain holes to help prevent freezing caused by water ingress, though ideally the piping should be arranged to prevent this. Complete vessel protection assemblies can be supplied comprising of two relief valves, divertor valve, bursting discs and interconnecting pipe-work
Each valve is individually calibrated and stamped with the date of manufacture, and has it’s own unique serial number prior to dispatch.
All materials used are selected for their suitability to function at cryogenic temperatures. All valves are degreased for oxygen duty.
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DESCRIPTION
Bronze/Brass safety/relief valves for protection of hot water heating boilers, systems, cookers, sterilizers and similar equipment.
FEATURES
o ASME Certified Capacity
o 20-60 psig Set Pressures
o Corrosion Resistant Construction
o Polished Chrome Finish
o Directive 97/23/EC (PED) Compliance Available
o MADE IN THE USA
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Series 2700
ASME NB Certified: Air, Steam & Water
European CE Approved
Sizes 1/2%u2033 X 1%u2033 to 1-1/2%u2033 X 2-1/2%u2033. Effective orifice areas from 0.068 to 0.573
square inches. Pressures from 15 to 6500 psig. Temperature range of -450° F
to +750° F.
Stainless steel body and trim with carbon steel bonnet. Optional materials of
construction include complete 316 stainless steel, Monel, and Hastelloy C.
Materials suitable for NACE service available.
Available with threaded, flanged, socket weld, welding nipple or sanitary connections.
Optional O-ring seat for ultimate tightness. Maximum blow down
of 10% to 20% on all fluids. Balanced design available in %u201CC%u201D and %u201CD%u201D orifices
which nullify effects of backpressure.
Applications: air, gas, vapor, and liquid process service.
Series T6000
Series
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The valves are especially designed for protection of components against excessive pressure and to meet the strict quality demands and safety requirements for industrial refrigeration installations, specified by international classification societies
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Revalco Safety valves are springloaded safety devices for protection against inadmissable pressures.
The valves can be used for protection of pressure vessels, compressors, liquid lines and in all places where overpressure could severely damage the installation and/or the surroundings
Working media
Applicable for all common refrigerants such as NH3, R22, R134A, R404A, R502, R507, R404A, R407C, R410A and non-corrosive gases/liquids. When using brines or refrigerants other then the above mentioned please consult your local Revalco representative.
Testing and Certification
Every valve will be calculated according to EN13136 and factory tested according to EN12284. The Design is according to CE PED 97/23/EC.
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- Model / code: S153
- Category: Safety Valve
- Body Material: Brass or stainless steel
- Inlet Pressure: 450 bar
- Outlet Range: 5-450 bar
- Connections: 3/8 " BSPP
- Valve Size: 5 mm
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