4″ Steam Jacketed Outside Screw & Yoke Hydrolet QRB Valve – Straight Outlet

This valve has the same features as our Steam Jacket Q.R.B. but with the added advantage of having an outside screw and yoke which isolates the threads of the stem from the product being hauled.  The steam jacketed Q.R.B. is designed to handle temperature sensitive liquids. The quick removable bonnet permits easy dismantling for cleaning and inspection. The valve is available in three styles in 3” and 4” sizes with flanged or threaded outlets.  The valve is constructed of 316 stainless for compatibility with a wide range of products.  The jacket material is 304 stainless and the two steam connections are ¾” NPT female.

Pressure and Temperature Rating:

  • Max working pressure (MAWP): 35 psi [2.4 bar]
  • Max temperature (dependent on seal):
  • PTFE, FKM or Non-Asbestos: 400°F [204°C]
  • Nitrile (Buna-N): 230°F [110°C]


Product Details

Assembly NumberDimensionsFlange-Inlet & OutletOutlet Wt.
JY724SST A: 18 7/8" [479 mm]
C: 5" [127 mm]
D: 4 5/16" [110 mm]
I.D.: 4 3/8" [111 mm]
B.C.: 5 7/8" [149 mm]
Holes: 8-7/16" [11 mm]
Flanged26.0 lbs (11.8 kg)
JY734SST A: 18 7/8" [479 mm]
B: 6 7/16" [164 mm]
D: 4 5/16" [110 mm]
I.D.: 4 3/8" [111 mm]
B.C.: 5 7/8" [149 mm]
Holes: 8-7/16" [11 mm]
4" Threaded26.0 lbs (11.8 kg)
NOTE: Stainless 316 valves are standard with PTFE disc, gasket & packing (Suffix "T"). For variations and replacement parts see section 10, Page 5B.

Repair Kits and Accessories

Teflon Accordion Packing

Engineering Bulletins

EB-03-18: Procedure for Pneumatic Leak Test of Hydrolet Valve (Pre-Load Qualification)
EB-09-99: Q.R.B. Hydrolet Clamp Ring Installation and Torque Rating.
EB-08-99: Important Safety Instruction – Outside Screw & Yoke (OS&Y) Hydrolet Valve