CHECK VALVES HAM-LET H-400 SERIES H-400 General purpose fixed cracking pressure check valve (MAWP 3,000 psig) High-performance fixed cracking pressure check valve (MAWP 6,000 psig) ECE R110 approved for CNG/NGV fixed cracking pressure check valve (MAWP 3,770 psig) Compact one-piece fixed cracking pressure check valve (MAWP 3,000 psig) One-piece adjustable cracking pressure check valve (MAWP 3,000 psig) Adjustable cracking pressure check valve (MAWP 3,000 psig)

GENERAL PURPOSE FIXED CRACKING PRESSURE CHECK VALVE H-400 SERIES FEATURES y y y y y 316 SST or brass body construction Moderate-pressure characteristics up to 3,000 psi (206 bar) Compact design Varying fixed cracking-pressure springs HAM-LET LET-LOK®, male & female NPT, and HTC® face-seal bead ends The H-400 series is a compact check valve designed for instrumentation. H-400 valves are normally closed. When differential pressure between the inlet and outlet is higher than the set pressure of the spring, the poppet opens to enable a free passage of flow, through the valve. For vacuum applications,...

STANDARD CONFIGURATION DIMENSIONS Connection / Size Inlet 1/8'' LET-LOK 1/4'' LET-LOK 6 MM LET-LOK 3/8'' LET-LOK 8 MM LET-LOK 10 MM LET-LOK 1/2'' LET-LOK 12 MM LET-LOK 3/4'' LET-LOK 1'' LET-LOK 1'' LET-LOK High flow 1/8'' Female NPT 1/4'' Female NPT 3/8'' Female NPT 1/2'' Female NPT 3/4'' Female NPT 1'' Female NPT 1'' Female NPT High flow 1/8'' Male NPT 1/4'' Male NPT 3/8'' Male NPT 1/2'' Male NPT 1/4'' Male Face Seal 1/2"Male Face Seal 1/8''Male NPT 1/4''Male NPT 1/8'' LET-LOK 1/4'' LET-LOK 6 MM LET-LOK 3/8'' LET-LOK 8 MM LET-LOK 10MM LET-LOK 1/2'' LET-LOK 12 MM LET-LOK 3/4'' LET-LOK 1'' LET-LOK...

GENERAL PURPOSE FIXED CRACKING PRESSURE CHECK VALVE H-400 SERIES CRACKING PRESSURE BACK PRESSURE The differential pressure between the inlet and outlet, at which an initial flow passes through the valve. The differential pressure between the inlet and outlet pressures. Maximum allowable back pressure is rated to 1,000 psi (69 bar) for 1/4, and 200 psi (14 bar) for 3/8 to 1". RESEAL PRESSURE In systems where pulses, pressure shock or pressure surges occur , please select the H-400HP Series. The differential pressure between the outlet and inlet, at which no flow passes through the valve. Lubricant-free...

CLEANING & PACKAGING Every H-400 series check valve is cleaned in accordance with Standard Cleaning and Packaging (Procedure 8184). Oxygen Clean & Lubricant-Free Cleaning and Packaging, in accordance with Special Cleaning and Packaging (Procedure 8185), is available as an option. The H-400 valve designs have been tested for pressure and burst. Every H-400 valve is factory tested for proper assembly with nitrogen at 1,000 psig (68 bar) for 10 seconds. Every H-400 valve is factory tested for functionality at therelevant cracking pressure, each for five cycles. No detectable leakage is allowed during...

HIGH PERFORMANCE FIXED CRACKING PRESSURE CHECK VALVE H-400HP SERIES FEATURES 316 SST construction High-pressure characteristics up to 6,000 psi (413 bar) Small size Variable fixed cracking pressure HAM-LET LET-LOK, Male & Female NPT, and HTC face seal bead ends y Suitable for vacuum applications y ECE R110 approved for CNG/NGV as an option The H-400HP series is a compact, robust and heavy duty valve designed for high-pressure (up to 6,000 psi) instrumentation panels and systems. H-400HP valves are normally closed. When the differential pressure between the inlet and the outlet is higher than...

CLEANING & PACKAGING Every H-400HP series check valve is cleaned in accordance with Standard Cleaning and Packaging (Procedure 8184). Oxygen Clean & Lubricant-Free Cleaning and Packaging, in accordance with Special Cleaning and Packaging (Procedure 8185), is available as an option. STANDARD CONFIGURATION DIMENSIONS Valve Type Inlet 1/8" LET-LOK® 1/4" LET-LOK 3/8" LET-LOK 1/2" LET-LOK 3/4" LET-LOK 1" LET-LOK 6MM LET-LOK 8MM LET-LOK 10MM LET-LOK 12MM LET-LOK 22MM LET-LOK 25MM LET-LOK 1/4" Female NPT/BSPT 3/8" Female NPT/BSPT 1/2" Female NPT/BSPT 3/4" Female NPT/BSPT 1" Female NPT/BSPT 1/4" Female...

HIGH PERFORMANCE FIXED CRACKING PRESSURE CHECK VALVE H-400HP SERIES Different materials are available for special applications. The H-400HP valve design has been tested for pressure and burst. Every H-400HP valve is factory tested for proper assembly with nitrogen at 1,000 psig (68 bar) for 10 seconds. No detectable leakage is allowed during shell test. Temperature Rating O-Ring Material Every H-400HP valve is factory tested for functionality at the relevant cracking pressure, five cycles each. No detectable leakage is allowed during shell test. H-400HP SERIES ORDERING INFORMATION OPTIONAL H-4...

ORDERING INFORMATION SPARE PARTS KIT/REPAIR KIT SEAL KIT The kit includes o-ring, back-up and bonded poppet and label. Body Designator per End Connection Seal Material SPRING KIT The kit includes spring & label. Body Designator per End Connection Cracking Pressure WARNING! The system designer and user have the sole responsibility for selecting products suitable for their special application requirements, ensuring their safe and trouble-free installation, operation, and maintenance. Application details, material compatibility and product ratings should all be considered for each selected product....

COMPACT ONE-PIECE FIXED CRACKING PRESSURE CHECK VALVE H-400OP SERIES GENERAL The H-400OP series is a compact one-piece check valve designed for moderate pressure (up to 3,000 psi) instrumentation panels and systems. H-400OP valves are normally closed. When the differential pressure between the inlet and the outlet is higher than the set pressure of the spring, the poppet will open and allow flow through the valve. For vacuum applications, please select the H-400HP series. MATERIALS OF CONSTRUCTION Item No. Components 1 2 3 4 5 6 Valve Body Material Brass Brass ASTM B-16 Lock Screw* O-Ring* O-Ring*...