Standard Pilot Vented Load Control Valves

Threaded cartridge valve used to control loads due to hose or tube failure, or because of a runaway load caused by an over center cylinder condition or lowering of a load.

Полное описание продукта

Parker’s counterbalance, or load control, valves are available either vented, or non-vented style. The vented valves are available in flow ranges from 5 gallons per minute up to 48 gallons per minute, and pressures up to 5000 psi.

Typical uses of these valves are in applications where:
• Loads are lowered and a smooth operation is required to prevent a runaway condition
• Loads are handled using a cylinder operating in an over center condition
• Load drift needs to be eliminated due to control valve spool leakage

Sizing a counterbalance valve needs care in that the flow required is usually higher than system pump flow, as in the case with a cylinder application (retract flow could be twice the system flow). Oversizing the valve could cause instability. When the pressure setting is critical, a vented load control is preferred. Pressure in the spring chamber of the valve is vented to atmosphere and therefore independent of any back pressure from the tank line.

The pilot ratio is the ratio of the pilot area versus the differential area poppet. Thus, the higher the pilot ratio, the less pressure that is needed to assist the load pressure in unseating the poppet. This means there is less restriction to the overrunning load, resulting in less horsepower required and more control of the load. So higher pilot ratio equates to less restriction to the overrunning load, less control and less horsepower required. Lower ratio equates to more restriction to the overrunning load, more control and more horsepower required. The pilot ratio decision is one of Horsepower versus Control. For reference the most popular ratio is 6:1.

Parker offers counterbalance valves with adjustable and non-adjustable pressure settings. Non-adjustable, or shimmed version, is recommended for most applications as it prevents tampering or improper adjustment by uneducated users.

Характеристики

Тип монтажа:	Threaded Cartridge Valve, Single Inline, Single Gasket, Double Inline, Double Gasket
Расход:	5.3, 15.9, 48, 10, 25, 15, 30 Gal/min, 20, 60, 180, 37.5, 93.75, 46.25, 112.5 L/min
Максимальное расчетное давление на входе:	6000, 5075, 5000, 3000 psi, 420, 350, 210 bar
Расположение вспомогательного клапана:	External, Internal
Перепад давлений в системе управления:	4.5:1, 15:1, 3:1, 8:1, 1:1, 4:1, 7:1, 10:1, 5:1, 6:1
Фиксирующее давление:	3120, 500, 1000, 1500, 2000, 2500, 3000, 5000, 3500, 250-500, 500-1500, 1500-3000 psi, 215, 34.5, 69, 105, 140, 170, 210, 350, 103.4, 240, 17.2-34.5, 34.5-103.4, 105-210 bar
Диапазон регулирования давления:	725-6000, 1450-5075, 725-5000, N/A psi, 50-420, 100-350, 50-350, N/A bar
Чувствительность регулирования давления:	1220 per turn, 1650 per turn, 1335 per turn, 725 per turn, N/A psi, 84 per turn, 114 per turn, 92 per turn, 50 per turn, N/A bar
Размер резьбы порта:	N/A, 3/8", 1/2" inch
Интенсивность утечек:	6 @ 1450 PSI (100 BAR), 5 @ 80% of setting drops/min
Размер полости:	53-1, 68-1, 3C, CDD-1010, CDD-1036, N/A
Регулировочный механизм:	Screw Adjustment, Tamper Resistant Cap, Shimmed (non-adjustable), Standard (adjustable), N/A
Материал уплотнения:	Nitrile, Fluorocarbon
Рабочая температура:	-30° to +250°, -15° to +400° °F, -34° to +121°, -26° to +204° °C
Материал клапана:	All parts steel. All operating parts hardened steel
Материал корпуса:	N/A, Aluminum
Максимальная кинематическая вязкость:	Mineral-based or synthetic with lubricating properties at viscosities of 45-2000 SSU (6 to 420 cSt) cSt
Показатель эффективности фильтра:	ISO 4406 18/16/13, SAE Class 4
Вес:	0.18, 0.73, 1.17, 0.88, 1, 1.5, 3, 2.5, 4.5 lb, 0.08, 0.33, 0.53, 0.38, 0.44, 0.68, 1.36, 1.13, 2.05 kg
Момент затяжки при монтаже:	22, 40, 63, 50-55, 75-80, N/A lb-ft, 30, 54, 85, 68-75, 102-108, N/A Nm