Jordan Valveâs âJâ? Series has a new addition to the product line. The JHR is a slightly higher flow model of its low-flow regulator line. The JHR is available in a 1/2″ line size and has an available Cv of 1.2. This is approximately double the flow capacity of the other low-flow regulators. Valves from Jordanâs âJâ? Series can handle working pressures as high as 3600 psig (248 bar) and operating temperatures to 575°F (300°C). These valves typically come in Stainless Steel or Chrome Plated Brass but can come in a wide variety of materials such as titanium, Hastelloy (B&C), Monel or Alloy-20.