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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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- with double sided pipe connections
- with screw-in spigot
- standard with Viton-seal and one bar opening pressure
- other variations according to customer requirements
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WITT gas Non-return Valves protect equipment, pipelines and outlet points. Varying from 0.004 bar - 40 bar (0.06 - 580 psi) and flows between 0.010 m³/h - 3.000 m³/h (0.35 - 105925 SCFH) with any wanted connection. Nearly every application will find a solution when gas return has to be prevented.
Some non-return valves are flashback safe in accordance with EN 730 when natural gas and air are mixed, which can be mounted in nay position and do not require gravity.
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WITT safety devices are used to protect single cylinders, outlet points or pipelines against gas back feeding and flashback and meet various National and International Standards e.g. EN730. Appropriate checks are made by the certification authorities - BAM, TÜV and Underwriters Laboratories etc. Pressure control systems, points of use and complete energy supply systems (MECS) incorporate these devices.
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The PLC series auxiliary valves are direct-acting, factory-set pressure relief valves of the cartridge type that can be supplied with or without a threaded plug. They can also be supplied with housings to facilitate in-line installation. PLC valves are intended primarily to act as combined pressure-relief and anti-cavitation valves - otherwise known as port relief valves - in the service ports of our directional valves. However, they can also be used to advantage in other situations where pressure relief valves in this size range are required. Indeed, PLC cartridge valves are purchased in great quantities by several of the world%u2019s leading pump and transmission manufacturers.
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Pilot-operated check valves of the series CP allow free flow in one direction.
The counter-flow direction is blocked. By applying the pilot pressure, the poppet can be lifted from its seat against the pressure. Thus flow in the counter-direction is also possible. There are 1 and 2 stage poppets available with pilot ratios of 1 : 5 and 1 : 40, to suit different operating conditions.
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The check and pre-fill valves type F utilize a spring pre-loaded valve head.
The check valves type F enable free flow in one direction and block the flow in the opposite direction.
This valve is used as a high flow valve (check valve with hydraulic release) in top ram presses for quickly draining and replenishing press cylinders during opening and closing in rapid traverse mode. The smaller sizes may be equipped with a pre-reliefe device as an option to prevent pressure surges during decompression (high volume and high pressure surge).
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Pressure Relief Valve type LV / LNV
The safe and economic solution to protect your pump and plant against over-pressure.
Function:
The pneumatic Pinch Valve will be pressurized through the pressure relief section by a minimum differential pressure of 2 bar air supply over medium pressure. When the medium pressure in the pipeline increases, the Pinch Valve start to open and the overpressure passes trough the bypass and the Pinch Valve.
The rising and falling pressures can be controlled over pressure switches.
Type LV (if control air is available) and Type LNV (if control air is not available) are especially designed to handle products with solids, paste and fibers.
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BUTTERFLY CHECK VALVE-COMBINED
1. FEATURES
This valve is operated by the actuator of cylinder,motor or etc for the
butterfly valve function.
If this valve is installed in front of pump,this valve can be used for
controling flux, however,at the time of emergency or electricity failure this
valve can be converted to check valve.
2. DESCRIPTION
-. SERVICE TEMP' : -20°C~+150°C
-. SERVICE CONDITION : SEA WATER , OIL , ETC
-. FLANGE RATING : ANSI , AWWA , DIN , JIS(KS) , ETC.
-. SIZE : 50A(2")~4000A(160")
-. FLANGE TYPE : FLANGE
-. ACTUATOR : CYLINDER , MOTOR , ETC.
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Description: This Ultra Miniature low cracking pressure check valve permits free flow in one direction and no (checked) flow in the opposite direction. This valve is specified in many applications because of its very low cracking pressure (typically less than 0.5 psig), its excellent repeatability, and leak-tight peration. Custom variations of barbed and threaded bodies are available. Contact the factory for details.
Material: Brass or 303 stainless steel.
Seals: Silicone. Optional materials: EPDM, Viton® and FFKM (Perfluoroelastomer)
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Global Manufacturer of Hydraulic Check, Relief, Flow Control and Directional Control Valves along with Quick Release Hose Couplings. Check Valve sizes to 2" and up to 6000 psi (414 bar)working pressure. Steel and Stainless Steel materials are standard with other materials available.
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Check valves for liquid flows or gas. Sealing through piston or elastomeric seals.
Pressure interval: 105 bar / 210 bar
Temperature interval: -20ºC / 200ºC
Connections: from 1/4" to 3"
Made in several alloys.
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Lift check valve
ND (nominal diameter): 15-300
other diameters or pressures under request
NP (nominal pressure): 10-420
Technology: Molded or Forged
Principle: Soupape
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Features:
The steel check valve features a simple, compact, low cost, low pressure drop design. This design also allows for flexibility in function. It can be scaled to any number of standard and non-standard sizes. All steel construction and Viton seals make it a durable and reliable performer while its easy to manufacture design makes it a cost-saver.
Specifications:
-1.5" size
-Scalable diameter
-Up to 250 psi
-All steel construction
-Yellow Zinc Plating
-Viton Seals
-Back flow hole, if needed
-Quantity Discounts
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Since 1900 when Atwood & Morrill Co., Inc. produced its first valve, it has innovated many advances in the valve industry. The company has developed an impressive range of high technology valves and gained a distinguished reputation for product integrity, performance and dependability.
The range includes:
Gate & Globe Valves
Atwood & Morrill - Parallel Slide Gate Valves
Atwood & Morrill - Three Way Globe Valves
Atwood & Morrill - Main Steam Isolation Valves
Atwood & Morrill - Wye Globe Valves
Non Return Valves
Atwood & Morrill - Feed Water Check Valve
Atwood & Morrill - Cold Heat Check Valve
Atwood & Morrill - Freeflow® Check Valve
Atwood & Morrill - Cold Heat Check Valve
Atwood & Morrill - Testable Check Valve
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Special design entailing practically no loss of head.
Body materials: Steel GE 280 or cast Iron GL 250 body, with or without coating.
Body coating: Ebonite, Butyl, Halar, Rilsan.
Hinge: Elastomer for all types of fluids.
Maximum operating temperature: 180°C.
Connection standards: Spacing NF.29 492, PN.10 - PN.16 and ASA 150
From DN.20 to DN.250
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Brass Midi Check Valves
Description:
Series 6 Brass Midi Check Valves are used in general industrial and plumbing applications. They feature a brass body with NPT female threaded end connections and positive back stop. Series 6 has a silent operation with low opening pressure and low pressure drop. It can be installed in a horizontal or vertical position. Maximum Pressure: 200psi (13.8 bar).
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Wafer type dual plate check valve
ND (nominal diameter): 50-1200
other diameters or pressures under request
NP (nominal pressure): 10-420
Technology: Molded
Principle: Double battant
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High Pressure, Low Flow
These valves are direct operated, differential poppet, dry spring chamber design. All ports can
accept full working pressure permitting their use also as a sequence valve or back pressure
controller regulator (BPR). Wetted alloys are stainless steel. Dynamic seals are UHMWPE. Static
seals are Buna. Optional: Viton add-V. EPR add-E. Wrench flats are standard on adjusting screws.*
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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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High Pressure. These valves are 316 S.S. ball type and soft seat (PTFE ring) in the 1/4 NPT, 1/2 NPT, 3/4 NPT, and 1 NPT sizes; Brass poppet on S.S. seat in the 2 NPT size. Control springs hold approximately 3 PSI. Optional higher pressure springs are available in the 2" NPT unit only.
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Sarasin-RSBD
Pressure Safety Devices
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.
Changeover Valves
Sarasin-RSBD R Type Changeover valve
Sarasin-RSBD DV Type Changeover valve
Sarasin-RSBD Starvalve RS type Changeover
Safety Relief Valves
Sarasin RSBD & SEBIM Safety Relief Valves
Sarasin-RSBD 71 Series Full Nozzle Pilot Operated Safety Relief valve
Sarasin-RSBD 78 Series Semi Nozzle Pilot Operated Safety Relief valve
Sarasin-RSBD 86 Series High Performance Full Nozzle Pilot Operated Safety Relief valve
Sarasin-RSBD 9 Series Portable Safety valve
Sarasin-RSBD MBP Atmospheric Relief valve
Sarasin-RSBD A7000 Series Safety Relief valve
Sarasin-RSBD Starflow S5
Sarasin RSBD - 71 Series Portable Pilot Operated Safety Relief valve
Sarasin RSBD - 63 Series Semi Nozzle Safety Relief valve
Starflow P3 Conventional Safety Relief valve
Starflow P5 Conventional Safety valve
Sarasin-RSBD Starflow P4 Balanced Safety Relief valve
Tank Blanketing Systems
Sarasin-RSBD Starblanketer
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The check valves permit flow in one direction only; the operation of the valve is based on the movement of a small disc. The disc shifts within the housing as the pressure differential changes from forward to reverse. A flat surface on one side of the disc seals off flow, while the other side allows flow to pass.
The check valves offer low "cracking pressure" and a minimum differential forward flow, less than 0.005 PSI in the standard units.
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Pilot Operated Relief Valve
In the mid-1940s, a new relief valve actuated with a pilot rather than a spring set a new standard for pressure control. The valve, manufactured over the years by companies like Garrett, USI, Axelson, and NUFLO, is now manufactured and sold by Cameron's Measurement Systems division. The NuFlo pilot-operated pressure relief valve is an example of a tradition of advanced design and high-quality manufacturing abilities. These valves offer advantages not found in other relief valves - spring or pilot operated.
TYPE HF
This is a full lift, pop-action valve with a fixed (5% to 7%) blowdown using a single non-flowing pilot. This type of valve is designed for gas and/or vapor service and is offered in sizes of 1" through 8" with operating pressures ranging from 20 psig to 6000 psig.
Type HL
This is a modulating valve with a fixed (3% to 5%) blowdown using a single non-flowing pilot. This valve is designed for gas, vapor and/or liquid service and is offered in sizes of 1" through 8" with operating pressures ranging from 15 psig to 1500 psig.
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Cepex designs and manufactures an extensive family of check valves that can be used for a wide range of applications. These valves provide an exact and reliable control of fluids, and have been designed to offer maximum modularity and flexibility.
Spring check and ball versions are available in PVC-U and Corzan CPVC. As with other Cepex valve products, check valves are available in accordance with several dimensioning standards (Metric, BSP, ASTM, NPT, British Standard, JIS...).
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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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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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