How SLS Seals Work


Find out how SLS seals work and why they’re necessary for FLS slab gate valve operation.

SLS seals or Spring Loaded Seals are high-quality stem packings for use in FLS-style slab gate valves. They’re used in the bonnet of the valve around the stem. This type of seal is designed to keep pressure and lubricants in the valve while keeping contaminants out. Keep reading to find out more about how our spring loaded seals work.

How SLS Seals Are Constructed

The SLS seal provided by Heshka Oil is a dual spring energized encapsulated seal with a Carbon/Moly filled PTFE jacket. The cantilever spring in the jacket is made from 300 series stainless steel with Elgiloy available as an upgrade when needed. Depending on the rated working pressure, an unfilled PEEK backup ring may be required.

Additional options for the SLS seal provided by Heshka Oil include SLS seals with cantilever springs to aid in lower pressure sealing requirements.

SLS Seal Sizes and Pressures

SLS seals are available for valves ranging in size from 1-13/16” to 7-1/16”. The pressure ratings for SLS seals range from 5,000 PSI to 20,000 PSI. Heshka Oil also has the ability to work with our customers to manufacture custom SLS seals in different sizes and pressures.

Getting Replacement SLS Seals for Your FLS Gate Valves

SLS stem seals can be replaced when performing maintenance on your gate valves, and you can get everything you need from Heshka Oil. We keep a variety of FLS gate valve parts in stock including SLS seals in all sizes. Our ability to maintain stock and ship parts fast means our customers experience minimal downtime.

With our exceptional quality and service, there is no need to look anywhere else. You can purchase SLS seals directly online from our website or by calling our experienced sales team at 936-760-3453.

Save Time and Money - Buy SLS Seals Online!

Do you need other FLS slab gate valve parts? Read more product overviews, guides and reviews on the Heshka Oil blog.

Posted On:

22nd Jun 2022