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When you need finished Integrated Hydraulic Circuits with extremely short lead times, the Parker Speed Shop is the place to go. Parker’s expert application engineers, along with the latest computer-aided design and manufacturing technology, can bring new and advanced custom products to market faster, keeping you way ahead of your competition.
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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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Types MG and MK
Throttle valves and throttle check valves
* Sizes 6 to 102
* For in-line installation
* Pressure and viscosity-dependent
* Type MG: Throttling in both directions of flow
* Type MK: Throttling in only one direction of flow, free flow in the opposite direction (opening pressure 0.5 bar)
* With optional surface coating
* Special media (e.g. emulsion, water) on inquiry
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Type LC..DB (cartridge) and type LFA..DR (control cover)
2-way cartridge valves with pressure reducing function
* Sizes 16 to 100 (size 125 on inquiry)
* Standardized installation to DIN ISO 7368 (up to size 100)
* Implementation of isolating and pressure stage circuits possible
* Closed rest position
* When the set pressure is reached, port B is limited according to the pressure/flow characteristics
* Various control valves for manual and/or electrical-proportional pressure adjustment
o Integrated in the control cover
o Additionally built-on as pilot control valve
o Various combination options
* Various closing pressures
* Various adjustment types with manual pressure adjustment
* Variable nozzle fittings
* Mounting screws included in the scope of delivery of the cover
* Special media (e.g. emulsion, water) on inquiry
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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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