IMH Handbook of Hydraulics and Pneumatics Actual Size THE LEE COMPANY Industrial Microhydraulics Group

IMH Handbook of Hydraulics and Pneumatics 8th Edition THE LEE COMPANY INDUSTRIAL MICROHYDRAULICS GROUP 82 Pequot Park Road Westbrook, Connecticut 06498-0424 U.S.A. Phone: 860 399-6281 Fax: 860 399-7058 (order entry)

^r(0 (• introduction THE LEE COMPANY For over 70 years, The Lee Company has pioneered the design and manufacture of miniature precision fluid control components for a wide range of industries such as aerospace, oil production, Formula 1 car racing and medical/scientific instrumentation. To date, more than 100,000,000 Lee Plugs®, Restrictors, Valves and Safety Screens have been delivered to aerospace manufacturers alone, worldwide. A typical commercial jet employs an average of 4,000 such Lee Parts. Lee Products are specifically engineered to enable designers to reduce the size and weight of their...

INSERTS INTRODUCTION INSERTS The first section of the Handbook contains products intended for installation into metals (Section Two products are to be installed into plastic). The inserts are designed using the insert principle, which uses a pin to expand a grooved section of the insert's body into the housing wall to effect a seal and retain the component. The pin, which has been pre-installed, is driven into the body. Using friction and penetration, the lands bite into the housing material. The Lee Company does not recommend the use of coatings or surface treatments in the area of the installation...

inserts section I A2 Features and Benefits • Compact designs - Minimize housing size. • Integral locking end - Long life. - No o-rings to fail. • Pre-assembled - Easy to integrate into automated assembly lines. • 100% Tested - Eliminates rework, reducing internal costs. - Enhances customers' product quality. - Guaranteed performance. • All metal design - Wide operating temperature range. - Compatible with most fluids.

INSERT CHECK VALVES The IMH Chek™ is a threadless, cartridge-style insert designed for simple, low cost installation into manifolds, and is based on the same hard seat Lee Chek® designs used in flight control systems of almost every aircraft flying today. A robust design and 100% testing ensures consistent, longterm performance up to 28 MPa (4060 psid) and 149°C (300°F) or higher depending on specific application requirements. A high quality metal to metal seat limits leakage in the checked direction to no more than 20 sccm of air at 172 kPa (25 psi) differential. The valves are compatible with...

INSERT CHECK VALVES Features and Benefits • Metal to metal seating – Provides high reliability. – Long life. • Leak tight – Efficient system performance. • Guided ball design – Fast response. – hysteresis. Low • Positive ball stop – Infinite spring life. – Stable performance. • Screened versions – Blocks rogue contamination. • Ceramic ball versions – Compatible with aggressive fluids. • Axial and side exit versions – Design flexibility.

insert check valves558 SERIES CHEK VALVE - REVERSE FLOW REVERSE INSTALLATION HOLE CHEK VALVE ACTUAL SIZE * LOA before installation. All dimensions in millimeters. PERFORMANCE Lohm Rate: 250 Lohms Leakage: 20 sccm/min. (max.)@172 kPa (25 psid) on air 1 Drop/min. (max.) on hydraulic fluid Maximum Working Pressure: 28 MPa (4,060 psid) (Checked Direction) 4 MPa (580 psid) (Flow Direction) AP (kPa) Flow Curve for 40 kPa Valve For installation procedure see page A1.

INSERT CHECK VALVES 558 SERIES CHEK VALVE – FORWARD FLOW FORWARD CHEK VALVE Lohm Rate: 250 Lohms 45 PERFORMANCE 20 sccm/min. (max.)@172 kPa (25 psid) on air 1 Drop/min. (max.) on hydraulic fluid Maximum Working Pressure: 28 MPa (4,060 psid) (Checked Direction) 4 MPa (580 psid) (Flow Direction) ∆P (kPa) Flow Curve for 40 kPa Valve CRACKING PRESSURE

REVERSE CHEK VALVE INSTALLATION HOLE T~ 5.65 5.55 * LOA before installation. All dimensions in millimeters. PERFORMANCE Lohm Rate: 400 Lohms Leakage: 20 sccm/min. (max.)@172 kPa (25 psid) on air 1 Drop/min. (max.) on hydraulic fluid Screen Size: 125 Micron Absolute Maximum Working Pressure: 28 MPa (4,060 psid) (Checked Direction) 4 MPa (580 psid) (Flow Direction) For installation procedure see page A .

FORWARD INSTALLATION HOLECHEK VALVE AP vs. Flow on Water @80°F (27°C) AP (PSI) PERFORMANCE Lohm Rate: 400 Lohms Leakage: 20 sccm/min. (max.)@172 kPa (25 psid) on air 1 Drop/min. (max.) on hydraulic fluid Screen Size: 125 Micron Absolute Maximum Working Pressure: 28 MPa (4,060 psid) (Checked Direction) 4 MPa (580 psid) (Flow Direction) For installation procedure see page A .

REVERSE CHEK VALVE INSTALLATION HOLE ACTUAL SIZE * LOA before installation. All dimensions in millimeters. PERFORMANCE Lohm Rate: 250 Lohms Leakage: 20 sccm/min. (max.)@172 kPa (25 psid) on air 1 Drop/min. (max.) on hydraulic fluid Maximum Working Pressure: 28 MPa (4,060 psid) (Checked Direction) 4 MPa (580 psid) (Flow Direction) For installation procedure see page A .

INSERT CHECK VALVES 558 SERIES CHEK VALVE – CERAMIC BALL FORWARD FLOW FORWARD CHEK VALVE (12.6) Lohm Rate: 250 Lohms Leakage: PERFORMANCE 20 sccm/min. (max.)@172 kPa (25 psid) on air 1 Drop/min. (max.) on hydraulic fluid Maximum Working Pressure: 28 MPa (4,060 psid (Checked Direction) 4 MPa (580 psid) (Flow Direction) ∆P (kPa) Flow Curve for 40 kPa Valve CRACKING PRESSURE

insert check valves 855 SERIES CHEK VALVE - REVERSE FLOW REVERSE CHEK VALVE (13.1) -|-- 10.1 ACTUAL SIZE (As Installed) * LOA before installation. All dimensions in millimeters. PERFORMANCE Lohm Rate: 75 Lohms Leakage: 20 sccm/min. (max.)@172 kPa (25 psid) on air 1 Drop/min. (max.) on hydraulic fluid Maximum Working Pressure: 28 MPa (4,060 psid) (Checked Direction) 4 MPa (580 psid) (Flow Direction) For installation procedure see page A .

insert check valves855 SERIES CHEK VALVE - FORWARD FLOW LEE PART NO. PERFORMANCE Lohm Rate: 75 Lohms Leakage: 20 sccm/min. (max.)@172 kPa (25 psid) on air 1 Drop/min. (max.) on hydraulic fluid Maximum Working Pressure: 28 MPa (4,060 psid (Checked Direction) 4 MPa (580 psid) (Flow Direction) For installation procedure see page A .