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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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Model RC (Request form #VRC1)
Dual relief, differential poppet style for cylinders or motors of equal displacement to cushion shock or surge pressures.
Adjustable or non-adjustable. 500 to 3000 psi.
30 gpm capacity, ductile iron body.
Model RD (Request form #VRD1)
Hydraulically dampened differential poppet-style relief valve.
Adjustable or non-adjustable. 500 to 3000 psi. 30 gpm capacity.
Model RV (Request form #VRV1)
Pilot operated relief valve.
Adjustable from 400 to 3000 psi.
40 gpm capacity.
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Pressure relief valve Prv 42
All hydraulic systems must be equipped with a pressure relief valve.
Sunfab in-line mounted pressure relief valve Prv protects the pump and hydraulic system
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The 289 Series relief valves are spring-loaded throttling relief valves used downstream of pressure regulators to protect the downstream system from overpressure. A smooth throttling action minimizes pressure surges in the system during relief operation. The 289 Series relief valves are ideal for low-pressure settings due to the increased sensitivity provided by a large diaphragm area. The 289 Series relief valves are designed for pressure control; they are not ASME safety relief valves.
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Types:
Two Way Spool Valves are available in Normally Closed and Normally Open types
Two Position, Three Way Spool Valves
Two Position, Four Way Spool Valves
Three Position, Four Way Spool Valve
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This section includes three main types of dual relief valve: 1) Differential area/direct acting poppet type including single or dual cartridge versions. 2) Direct acting with make up checks. 3) Pilot type with vent feature and make up checks. Flows up to 380 litres/min (100 US GPM) and pressures up to 350 bar (5000 psi).
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Safety and Relief Valves
A variety of high and low pressure, metal or soft seated safety valves for a range of applications including the power, chemical, petrochemical and process industries. ASME 1 Boiler Safety Valves for all types of boiler and steam systems also available.
Pilot Operated
For premium tightness on difficult services, such as gas liquid, steam, flashing fluids, cryogenics etc.
* Pop or modulating action, Bubble tight performance
* Low-cost maintenance, In-situ testing available
* Not sensitive to back pressure
* Externally adjustable blowdown
* Stable even in two-phase flow
* High capacity/high pressure
* Configurations to suit dirty services
* Pressure Class: 1 to 425 bar (up to 690 bar optional)
* Sizes: 1” x 2” to 8” x 10” (single or dual outlet)
* Temperature range: - 252°C to +538°C
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FEATURES:
- OPTIONAL HIGH LIFT BALL SPRING RELIEF reduces noise, heat and chatter.
- OPTIONAL O’RING PORTS to eliminate leakage.
- STEEL BALL will not jam, lock or seize and will always open.
- CHROME ALLOY STEEL BALL is a grade No. 25 ball.
- HARDENED ALLOY STEEL SEAT to reduce wear.
- SHOT PEENED STRESS RELEIVED steel spring to increase life and consistent results.
SPECIFICATIONS:
- Pressure rating 3000 psi (207 bar).
- Pressure setting 150-3000 psi (10-207 bar).
- See creating a model code for flow capacity.
- Weighs 2 1/4 lbs (1.0 kg).
MATERIALS:
- Zinc Plated Steel Body
- Chrome Alloy Steel Ball
- Hardened Alloy Steel Seat
- Aluminum Alloy Body
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The Brand, adjustable pilot operated relief valve maintains the same cracking pressure at low and high flows. As the pressure setting is exceeded a poppet type relief opens and allows a small pilot supply of fluid to escape a chamber at the end of the main spool. The escape of pilot supply causes the main spool to shift and thus opens a passageway which allows the main volume of pressurized fluid to escape to tank without passing over the poppet type relief. The higher the pump output the farther the spool shifts over to enlarge the opening to tank.
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187 and 281 PRI
The 187 and 281 PRI valves are specifically designed to be the smallest valves available for safety relief applications. Both are constructed entirely of stainless steel and are available screened and unscreened for design flexibility. Built-in damping assures quiet operation.
The 187 PRI is the smallest relief valve, only three sixteenths of an inch in diameter and a little over a half inch long, covering cracking pressures from 20 to 100 psid. The 281 PRI offers 29 standard cracking pressures from 80 to 3,600 psid.
375 and 500 MOMENTUM PRI
The 375 and 500 Pressure Relief Valves use the patented “momentum free” design concept. The unique design compensates for momentum forces that upset the normal force balance of a direct acting valve. These forces are produced by local pressure gradients caused by changes in liquid velocity. (See “Momentum Forces” on page M20). The result is a valve that is both linear and stable throughout the operating range and has low hysteresis, yet is still miniature. The 375 PRI has full open flow capacity of 100 Lohms and the 500 PRI has a 50 Lohm capacity. Both are available in standard cracking pressures from 50 to 500 psid.
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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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