Frequently Asked Technical Questions

Here, we have answered questions of a technical nature that we find are most frequently asked by dahl customers.

If you have questions you do not find answered below, please contact us.

Q

Does dahl have submittal or technical data sheets?

A

Yes. To obtain Submittal Sheets or Technical Data Sheets on specific dahl products, click on the link or contact us.

Q

What is the material/metal used for the actual ball inside the 1/4 turn shutoff valve?

A

It is a nickel plated solid brass ball.

Q

What are the Cv values for dahl valves?

A

That will vary depending on the model. For assistance in getting Cv values for specific dahl valves, contact us.

Q

Is it necessary to dissassemble a mini-ball™ valve before soldering?

A

No, do NOT dissassemble. Leave it in the open position and aim the flame away from the center of the valve body.

Q

Does the QUICK-GRIP™ connection work on Poly-B?

A

No. The stainless steel insert for PEX pipe is too small for the larger inside diameter of Poly-B.

Q

Does dahl offer valves for CPVC pipe?

A

Yes. dahl offers valves with solvent glue joint connections designed for Copper Tube Size (CTS) CPVC pipe.  It is important to use mini-ball™ valves with our #46, #4466, #10 or #11 connections only.  dahl does not recommend using 5/8 OD Compression connections for copper pipe on CPVC pipe.

Q

Do dahl's Copper Tube Size CPVC connections work on FlowGuard Gold?

A

Yes. FlowGuard Gold is a brand name for a line of CPVC pipe and fittings.

Q

Do dahl's Copper Tube Size CPVC connections work on IPEX Aquarise?

A

No, IPEX AquaRise is made to Iron Pipe Size similar to Schedule 40.  However, dahl has provided IPEX with a list of popular mini-ball™ valves for end-of-line applications that may be useful for AquaRise installers.  Visit the IPEX website at http://www.ipexinc.com and click on the AquaRise Product Bulletin link on their AquaRise product page.

Q

What are the working pressure & temperature specifications for mini-ball™ valves?

A

250 psi and 250°F. However, this is subject to lower limitations depending on the pipe type and specific end connections that are supplied on the mini-ball™ valve.

Q

Can dahl valves be used on heating systems with a glycol & water mix?

A

Yes. dahl valves can be used in hydronic heating systems with up to a 50/50 water/glycol mix.

Q

Can we use dahl valves for gas or air?

A

No. The certifications and listings for valves used on gas and air systems are different than those for valves used for water.

Q

Can dahl valves be used for fuel or petroleum products?

A

No. The certifications and listings for valves used on gas and air systems are different than those for valves used for water.  Fuels or Petroleum based substances are not compatible with seal materials.

Q

What are the working pressure & temperature specifications for your Globe/Compression Stops?

A

200 psi and 250°F.

Q

What are the working pressure & temperature specifications for your Globe Radiator and Balancing Valves?

A

200 psi and 250°F for the Regular Pattern series.

250 psi and 250°F for the Heavy Pattern series

The Heavy Pattern series also comes standard with a Hi-Temp disc and is suitable for 150 Working Steam Pressure (WSP).

Q

Are dahl’s Heavy Pattern Globe Radiator and Balancing Valves suitable for one pipe steam systems?

A

No, they are not equipped with a drain in the seat and will therefore not allow proper drainage of condensate.

Q

Can dahl globe style valves be back-seated?

A

Yes. Open the valve fully (counter-clockwise) until the handle stops.

Q

Can I install a dahl globe style radiator valve backwards on the outlet of a radiator?

A

Yes. Installers have been putting these valves “backwards” on the return side of radiators for decades with no complaints.  There is approximately a 5% degradation in the Cv value, which tends to have a negligible impact given the low flow rates of these applications.