XTO674 / INA14 Series Low Cracking Pressure Check Valve

Brand: SOLH by Richge Technology 

Product Positioning

     SOLH XTO674 and INA14 series share the identical product platform, featuring ultra-low cracking pressure and dual-medium compatibility for compressed air and water. These threaded inline check valves are widely applied to prevent reverse flow in vacuum circuits and general pneumatic systems, also suitable for low-pressure liquid & water pipelines. XTO674 focuses on low-temperature working conditions, while INA14 covers standard and corrosion-resistant industrial scenarios.

 Model Code Classification & Naming Rule

     -- XTO674: Brass body, low-temperature resistant version (-30℃ minimum operating temp)

     -- INA14: Standard series, optional brass / SUS304 stainless steel body, normal temperature range (-5℃ minimum)

     -- Port size suffix definition: 01 = Rc1/8", 02 = Rc1/4", 03 = Rc3/8", 04 = Rc1/2"

 Shared Universal Technical Specifications

     -- Cracking Pressure: 0.01 MPa (0.1 bar), ultra-low threshold ideal for vacuum & low-pressure circuits

     -- Max Proof Pressure: 1.0 MPa

     -- Applicable Media: Compressed air, water, neutral inert gas & neutral liquid

  1. Operating Temperature Range

     -- XTO674: -30℃ ~ +80℃ (cryogenic resistant)

     -- INA14: -5℃ ~ +80℃

  2. Optional Seal Materials

     -- NBR (Standard): For air & clean water, applicable temp -5 ~ 60℃

     -- FKM: Oil resistant & high temperature resistant, up to 80℃

     -- CR: Weather-proof & abrasion resistant, optional for XTO674 series

  3. Valve Body Material Options

     -- XTO674: Solid brass body only

     -- INA14: Brass / SUS304 stainless steel (all key wetted parts stainless steel)

Typical Model Parameter Comparison Table

Core Product Advantages & Application Scope

  1. Ultra-low 0.01MPa cracking pressure

     -- Stable opening under -0.1MPa vacuum condition, effectively avoid vacuum loss and backflow of suction cup / vacuum generator.

  2. Bidirectional reliable sealing

     -- Smooth forward flow, zero reverse leakage; protects vacuum pumps, solenoid valves and cylinders from damage caused by reverse pressure surge.

  3. Mini inline threaded structure

     -- Directly installed inline within tubing without extra mounting brackets, perfectly fit compact narrow equipment layout space.

  4. Dual medium air & water universal design

     -- Compatible with both dry pneumatic circuits and low-pressure liquid water pipelines to reduce spare part inventory types.

  5. Full vacuum system compatibility

     -- Suitable for vacuum testing equipment and pulsating negative pressure vacuum circulation loops.

Installation & Model Selection Guidelines

  1.  Flow Direction Mark: An arrow "→" is printed on valve body to indicate medium flow direction; reverse installation will completely block fluid passage.

  2. Port Size Matching: Select Rc1/8" ~ Rc1/2" according to pipeline diameter; Rc1/4" (suffix 02) is the most common general specification.

  3.  Media & Temperature Selection Rules

     -- Low-temperature / vacuum working conditions → Choose XTO674 series

     --  Ordinary room-temperature air & clean water → INA14 with NBR seal
     -- Oil-containing media or high-temperature fluid → INA14 with FKM fluorine rubber seal

  3. Vacuum System Recommended Layout

     -- Install the check valve between vacuum generator, filter and suction cup to block air backflow and maintain stable vacuum degree during intermittent operation.

SOLH Interchangeability Advantage

     XTO674 and INA14 share identical overall dimensions, thread port size and core performance parameters. The two series can be directly cross-replaced on-site without pipeline modification, delivering superior cost performance compared to imported equivalent models.

One Sentence Summary

     SOLH XTO674 / INA14 inline threaded check valve with ultra-low 0.01MPa cracking pressure supports dual air & water media, optional brass/stainless steel body and multiple sealing materials, providing reliable anti-backflow protection for vacuum, cryogenic, general pneumatic and low-pressure fluid industrial pipelines.