Internal Chemical Hydraulic Valve


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Betts Internal Chemical Hydraulic Valve is classified as an internal self-closing stop valve and is widely used on DOT407 and 412 cargo tanks. The design of the internal valve shields the spring, valve seat, and hydraulic actuator safely within the confines of the cargo tank.  The 316-stainless body with an optional Hastelloy® overlay seat and replaceable Teflon™ seal make this a versatile and proven valve that satisfies the many requirements of the chemical transportation industry.

This valve meets the requirements of 49CFR §178.345-8 as tested and verified per TTMA RP84 when it is properly mounted and used in conjunction with a certified shear elbow.

The flange has a 1/8” NPT inlet port for the hydraulics and phonographic finish on the faces to ensure proper gasket sealing.

Valve MAWP: 50 psi [3.4 bar]
Minimum bursting pressure: 200 psi [13.8 bar]
Working temperature range: -40°F to 400°F [-40°C to 204°C]
Hyd. line pressure: Minimum 1,500 psi [103 bar]
Maximum 3,500 psi [241 bar]
Hyd. volume to fully open valve: 1.05 in3[17.2 ml]

  • For proper installation, a solid flat mounting surface must be provided with extended studs. See mounting pad (MP19741LC) and special gasket (G27229TD) for use between valve and elbow.
  • Recommended hydraulic pump HP46982ALSL and hydraulic distributor CH16283.


Betts prides itself in being able to provide products that meet a customer’s specific needs. As a result we do offer modifications to our product standards. While not every request is always feasible, we do our best to meet your specific needs. In many cases this modification is noted by adding a suffix to the end of the standard part number.  The following is a non-inclusive list of common options that are available for this product line .  If the options listed below do not meet your requirements please contact one of Betts’ Customer Service Representatives for further assistance. Please note that some product modifications may result in extended lead times.

Commonly Requested Options:

  • Suffix “017” option for valve with double O-ring replaceable seat.

Additional Information

S35P01A: Chemical Hydraulic Product Family