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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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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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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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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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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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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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The Valve is designed for precise control in pneumatic control circuits. It can be used as a relay valve to sequence specific signal operations or as a relief valve to limit pressure in a pneumatic system.
Fixed or adjustable pressure settings are available; the pressure range is 0-20 PSI. To adjust the valve, turn the adjusting screw clockwise to reach zero adjustment. Then turn the adjusting screw counterclockwise to the desired relieving or sequencing pressure. The valve can be supplied with an allen-wrench adjustment or a knob. The valve has straight ports for 1/16 I.D. flexible tubing, barbs for 1/16 or 1/8 tubing are also available.
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Series 6400/6600
ASME NB Certifi ed: Steam & Air
Sizes 1 X 2 to 4 X 6. Actual orifi ce areas from 0.150 to 7.087 square
inches. Pressures from 15 to 1500 psig. Temperature range from -20 F
to +1000 F. Steel body and bonnet with stainless steel trim.
Double blow down ring design meets the requirements of Section I of
ASME Code. Temperature equalizing disc for maximum seat tightness. Available
with exposed spring (6400) or closed bonnet (6600). Full nozzle design
for ease of maintenance.
Applications: steam boilers (6400) and organic fl uid vaporizers or hot water
boilers (6600).
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Pressure Relief Valves
* Fine pressure adjustment
* CNC precision machined parts
* Cost effective and reliable
* Variety of materials available
* Right-angle, 3-port design
Sigmamotor pressure relief valves operate when the system pressure raises above the set pressure of the valve to protect systems from damage due to blockages or excessive pressure situations.
Inside the valve a spring holds a diaphragm against the valve seat until preset pressure is exceeded, then the diaphragm is forced up and the material in the system is forced out of the relief port. The valve is set at 65psi at the factory but is easily field adjustable.
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Presenting pressure reducing valves for steam and air. A wide assortment of models is available, including pilot operated models, direct-acting models and models with integral separators and steam traps.
Operating Pressure Range: -12 - 300 psig
Operating Temperature Range: 32 - 428 F
Valves for controlling steam or air pressure. They provide the prescribed pressure even when flow rates fluctuate.
Selection can be made from among a wide assortment of models - including pilot operated and direct-acting models and models with integral separators and steam traps - to suit the objective or application.
The high precision pressure reducing valves for process applications employ a separator with steam trap and shock-absorbing spherical piston to yield a superior flow rate characteristic.
The basic configuration of the reducing valves for air is identical to that of those for steam, and therefore also yields a superior flow rate characteristic.
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Managers of vehicle service centers can now turn to our new thermal pressure relief device to protect against possible damage to their closed pipe systems caused by thermal expansion. For example, as oil warms, it expands and causes pressuresometimes oil that was 300 psi becomes 2,000 to 3,000 psi. Such pressure spikes can cause costly damage if they exceed the design capacity of pipes and system components. Our pressure relief valve returns fluid/material back to the tank, limiting the pressure to protect the system.
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Description:
The Becker Pressure Relief Valve is designed to be used with regulated natural gas supply systems that provide power to pneumatic valve actuators and instrumentation. In the event of supply gas regulator failure, the Pressure Relief Valve protects pneumatic components from overpressure. The Pressure Relief Valve is an inexpensive, compact, maintenance free safety mechanism which will ensure protection of your pneumatic actuators and instrumentation.
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LMI's diaphragm back pressure/anti-syphon valves apply positive discharge pressure to a metering pump system and act to stabilize the output of higher output LMI Metering Pumps when pumping into low or no-pressure systems. Pressure relief valves are designed to protect chemical feed systems from overpressure damage caused by defective equipment or deadheading. Valves are available in 1/4", 1/2", and 1" sizes in PP, PVC, PVDF, and 316SS.
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Series 4200
ASME NB Certifi ed: Steam
Sizes 1-1/4 X 1-1/2 to 6 X 8. Actual orifi ce areas from 0.316 to 11.39 square
inches. Pressures from 15 psig to 1000 psig. Temperature limit to 1000 F. Steel
body and open bonnet with stainless steel trim. Chrome moly body above 800 F.
Double adjusting ring design to meet the blow down and overpressure standards of
Section I of the ASME Code. Temperature equalizing disc for maximum seat tightness.
Full nozzle design for longer life and ease of maintenance. One piece guide mounted
low in the body for positive alignment.
Applications: steam boilers
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Back pressure relief valves; Panel mounting available; Large flow rate
Material:Body-PVC; Diaphragm membrane-Viton+Teflon plate
Adjustable range:5~100 psig
Working temperature:60C
Working fluid:Water corrosive liquid
Mounting type:Straighted on pipe line
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Reliable Pressure Relief:
Hayward Pressure Relief Valves protect piping system components from damage due to over pressurization. The valves work by sensing system pressure. When the system pressure exceeds the set pressure, the force of the excess pressure moves the valve piston off its seat to relieve the excess pressure and diverts some of the flow out the discharge port.
Easy to Set Pressure:
Hayward Pressure Relief Valves can be set by hand, no tools are needed, to relieve pressures from 5 to 75 PSI. Each size of relief valve is designed to cover this complete pressure range with just one, non-wetted, plastic coated spring. There is no need to change springs for different pressure ranges as with ordinary relief valves.
Molded Gauge Port:
An integrally molded 1/4" NPT gauge port on the valve body makes installation of a gauge to monitor the relief pressure easy. No drilling or extra fittings are needed.
No Corrosion Failure:
These all plastic relief valves have no metal parts and will never fail, jam or stick because of rusted or corroded components. They require no painting or epoxy coatings to survive corrosive environments.
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Series 3800
ASME NB Certified: Air, Steam & Water
European CE Approved
Sizes 1″ X 2″ to 12″ X 16″. Actual orifice areas from 0.15 to 109 square inches. Pressures
from 20 to 6170 psig. Temperature range of -450 F to +500 F. Steel body and
bonnet with stainless steel trim. Semi-nozzle design.
The D to T orifices meet API Standard 526 covering orifice areas and center-toface
dimensions. Full bore designs available with 1″ through 12″ inlets and orifice
areas from 0.719 to 109 square inches giving maximum capacity for a given inlet size.
All stainless snap acting and modulating non-flowing pilot controls minimize product
loss and provide maximum resistance to corrosion.
Standard O-ring elastomer seat main valve and pilot control minimizes fugitive emissions
and allows operation within 95% of set pressure. Materials include Viton, Buna
N, ethylene propylene, silicone and Teflon. Optional materials of construction include
complete 316 stainless steel.
Applications: air, steam, gas, vapor, and liquid services where maximum seat tightness,
operating pressures and precise adjustment are required. Excellent for natural
gas pipeline and compressor service.
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PTFE Pressure Relief Valves
Features
• High reliability
• Factory set
• Low pressure drop
• All mechanical
• Right-angle flow
• Flare type connection
• Bubble tight seal
Applications
• Special semiconductor equipment relief valve applications.
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Quik-Vent
Vacuum/Pressure Relief Valve
Series 684
Controls unsafe pressure conditions
The Quik-Vent vacuum / pressure relief valve is an excellent safety device for mounting on storage silos, bins or any other container to relieve excessive or unwanted air pressure that might be generated by a pneumatic conveying system or other process equipment.
Unsafe conditions are easily controlled by the Quik-Vent vacuum/pressure relief valve. Generous ports quickly exhaust air or gases to protect against sudden positive or negative pressure conditions.
Optional sensors are also available to provide an electrical signal to indicate when over or under pressure conditions are present.
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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), 1"(32mm), 1"(40mm), 2"(50mm)
● Working Pressure: 2~10 kgf/cm, 11~20kgf/cm
● Working Temperature: -45~+185C
● 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 its 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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Series 1890/1896M
ASME NB Certifi ed: Air, Steam & Water
Sizes 1/2 X 1 & 3/4 X 1 (1890) and 1/2 X 3/4 & 3/4 X 3/4 (1896M).
Effective orifi ce areas of 0.077 (liquid) and 0.089 (vapor) square inches. Pressures
from 15 to 800 psig for stainless steel (1890) and 15 to 300 psig for bronze
(1896M). Temperature range from -20 F to +750 F (1890) and -450F to +400F
(1896M).
Materials of construction include stainless steel body and trim (1890) and brass
body and trim with bronze bonnet (1896M).
Applications: air, steam, gas, vapor and liquid process applications (1890) and
where service is compatible with brass and bronze (1896M). Also suitable for
cryogenic applications.
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Positive Displacement (PD) pumps should always be installed with a Relief Valve in the discharge line, to protect the pump and piping against any type of line blockage, including the inadvertent closing of an isolation valve. Liquiflo manufactures two sizes of relief valves in both 316 Stainless Steel and Alloy-C.
Ten standard Liquiflo Relief Valve models are available, based on the body material, the port size, and the pressure setting range (see chart below). Models RV1000, RV1001, RV2000 and RV2001 are factory preset to discharge at 100 PSI (7 bar) unless a different pressure setting is requested when ordering; other models are preset to the pressure setting specified when ordering.
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