Watts 77F-CSI 4 Strainer, Flanged

The Watts 77F-CSI 4 is a 4" wye-pattern strainer with Flanged connections that removes pipeline debris and particulates to protect downstream equipment. It features a ptfe seat. Rated to 285 psi.

This steel flanged wye pattern strainer, 4 inch Watts Model 77F-CSI, is used in liquid and steam applications. The Strainer is furnished with blow off connections and machined seat that allows the screen to be self aligning and assures a perfect fit. The Strainer comes with a bolted screen retainer cover and non-asbestos gasket. The screen retainer cover is tapped for strainers clean out by removing the blow off plug or opening a blow off valve piped to the blow off outlet.

Features

• Wye pattern
• Steel body
• 304 stainless steel screen
• Flanged connections
• Includes: Strainer

Common Questions

Can I use this on steam?

77F-CSI 4 is listed by Watts for steam and liquid service. Its 285 psi WOG rating is a cold-service number, not the steam limit -- check the spec sheet for the WSP rating at your operating temperature.

Does it have a blowoff / blowdown port?

Yes. The retainer cap/cover is tapped for a blowoff connection, so you can flush accumulated debris by pulling the plug or piping a blowdown valve to it -- no need to break the strainer apart. The closure plug is included.

What is the "seat material" on a strainer?

A strainer has no seat -- nothing closes against anything. The PTFE called out here is the retainer-cap seal (the gasket between the cap and the body), which is what limits the temperature and chemical compatibility of the closure.

Specifications

• Type: Strainer
• Size: 4"
• Connection: Flanged
• Cap Seal / Gasket Material: PTFE
• Pressure Class: Class 150
• Max Pressure (WOG, psi): 285
• Application: Steam
• Country of Origin: China
• Warranty: 1 Year Limited
• MPN: 77F-CSI 4
• Lead-Free: No
• Strainer Pattern: Wye
• Screen Material: 304 Stainless Steel
• Blowoff / Drain Tapping: Yes
• Blowoff Plug Included: Yes
• Body Coating: None