Sinclair CollinsÂ® High Pressure Valves - Norman Equipment Co.

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HP Series High Pressure 3 Way2 Pressure Control Valve: How it WorksSinclair Collins® 3-Way Two-PressureHydraulic Control Valves are widely usedin press operations or in other similarapplications where low and highoperating pressures are employed.Diaphragm-operated, they may beactuated by manually, electrically ormechanically operated air valves. Theyare designed to control two pressuresystems where the low pressures rangefrom 50 to 2000 psi and high pressuresup to 3500 psi.The "low pressure" range of aTwo-Pressure Valve depends upon theHigh Pressure Automatic Inlet Valveordered for the assembly. High PressureAutomatic Inlet Valves are available for"low pressure" ranges of 50 to 150, 150to 400, and 400 to 2000 psi. Anadjustment screw on the High PressureAutomatic Inlet Valve provides accurateadjustment of the low pressure point(within the operating range) atwhich the high pressure "kicks in".In most press operations, low-pressureis used to close the ram the majority ofthe stroke. As the ram closes and meetsincreasing resistance, the resultinglow-pressure build-up lifts the plungerof the High Pressure Automatic InletValve admitting high pressure fluid intothe ram to close/clamp. The "kick-in"stage of the process can also bemanually controlled by substituting astandard 2-way normally closed valve inplace of the High Pressure AutomaticInlet Valve. Our model HP204-3001, a3/4" 4000 psi normally closed valve, isrecommended. This type of installationmight be used where the first phase of acure is run under low-pressure and thecure completed under high pressure.By the addition of a reverse-acting valvein the low pressure inlet line during theclosing stroke, the press ram can beheld in any position desired; or the ramcan be allowed to close the mold to thepoint where the ram pressure willincrease a few psi. This slight backpressure is used to close an inlet valvewhich bypasses the inlet pressurethrough a smaller orifice so the ram willclose slowly before the high pressureautomatically "kicks in".Pull-backs can be supplied through a3-way valve and the pressure removedfrom the pull-back cylinders while theram is stroking and also for curing time;at end of cure, the pressure can berestored to pull-back.8
HP Series High Pressure AutomaticInlet ValveFeatures and Benefits- Operating pressure 3500 psi (241 bar)- Media – Raw Water, Oil, Water and Soluble oil- Maximum temperature 160 O F (71 O C)- Variety of low pressure ranges- Adjustment screw permits accurate regulation of low pressure point- ASTM B-61 Bronze bodies- Hardened Stainless Steel Stem and Seats- U-Cup style stem sealsBasic DimensionsDimensions of 3-Way ValvesCatalog Number Range Inlet Port (NPT) Outlet Port (NPT) UNITS A B (dia) C DHP344-2001 50 - 150 psi3/4"3/4"English 10-3/4" 4-1/4" 2-1/2" 2-1/4"Metric (mm) 273.1 108 63.5 57.2HP344-2003 150 - 400 psi 3/4"3/4"English 10-3/4" 4-1/4" 2-1/2" 2-1/4"Metric (mm) 273.1 108 63.5 57.2HP344-2008 400 - 2000 psi 3/4"3/4"English 10-3/4" 4-1/4" 2-1/2" 2-1/4"Metric (mm) 273.1 108 63.5 57.2* An adjustment screw on the valve permits the high-pressure "kick-in" to be set at any pressure within this range. It is very important that the valves be adjusted toopen after the low-pressure has raised the ram and is near its ultimate pressure in the ram. Under no circumstances should the automatic high-pressure valve beopened during the full-stroke of the ram. These valves are designed only to finish the closing of the ram and should not be used for long sustained flows.9
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Page 3 and 4: HP Series High Pressure Process Con
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Page 9: HP Series High Pressure 3 Way2 Pres
Page 13: HP Series High Pressure Check Valve

Sinclair CollinsÂ® High Pressure Valves - Norman Equipment Co.

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