OTHER STANDARD CRACKING PRESSURES
Check-All Valve currently has in stock literally thousands of other cracking pressure springs which are not listed in the standard cracking pressure table.  If you desire a cracking pressure spring not listed as a standard, please contact the factory for more information on other cracking pressures that are available sales@checkall.com.  Since Check-All assembles valves to order in a timely fashion, if the non-standard springs are in stock, lead-time is not affected. All springs have a tolerance of + or - 15%.  Temperatures exceeding -320º to +400ºF contact sales@checkall.com.  1/8 PSI springs are not recommended for flow vertical down.  ½ PSI spring supplied if cracking pressure not specified. 
3SC Series Valves: Standard springs for 3SC Series are ½ and 1.5 PSI. 

OTHER STANDARD SPRING MATERIAL
This table shows only the spring materials that are the standard spring material for a given valve type and material. Since Check-All assembles valves to order in a timely fashion, many other spring material options are available. If the spring is in stock, this does not affect lead-time. Please contact the factory for more information if you would like a spring material other than the material listed as standard sales@checkall.com.

OTHER BODY MATERIALS AND INFORMATION
This table shows the standard body materials Check-All Valve currently offers. Other materials are available. Please contact the factory if there is another valve material you require that does not appear in the table sales@checkall.com. We currently make valves from other materials than are shown. In addition, we recognize our customer's desires as paramount and do our best to meet your needs.

MORE ALLOWABLE SEAT MATERIAL INFORMATION
Check-All Valve offers a wide variety of standard seat material options for nearly every valve we make.  The most common materials are shown in the table above. Check-All's unique trim design allows the use of standard o-ring sizes, which oftentimes are readily available in other materials. If one of the standard o-ring materials will not work in your application, please contact the factory and advise the material required sales@checkall.com. Some examples of common offerings include FDA compounds, FEP encapsulated o-rings, and many other elastomeric materials. Check-All assembles valves to order in a timely fashion, which means even special seat materials does not always equate to extended lead-times.