Valves for Shell & Tube Heat Exchanger
Two fluids, two isolation envelopes, and a blocked-in thermal-expansion hazard on the cold side. The exchanger valve set is about safe isolation of each side and protecting a liquid-full shell.
Which valves are used on a shell & tube heat exchanger?
A shell & tube heat exchanger carries 5 characteristic valve interfaces: shell-side inlet/outlet isolation, tube-side inlet/outlet isolation, thermal relief (liquid-full side), vents and drains, bypass (temperature control). Each position, its usual valve configuration and the engineering reason are below. Typical specs are indicative — line class and project specification govern.
The Valve Interface Map
Shell-side inlet/outlet isolation
Gate Valves →Gate or butterfly valve
Isolation for cleaning and bundle pulling; butterfly acceptable on cooling water, gate/ball on process.
Tube-side inlet/outlet isolation
Gate Valves →Gate or ball valve
Second envelope isolation - both sides must isolate independently.
Thermal relief (liquid-full side)
Safety & Relief Valves →Small thermal relief valve
A liquid-full exchanger blocked in between closed valves will overpressure from thermal expansion - the thermal relief protects it.
The most commonly missed valve on cooling-water sides of process exchangers.
Vents and drains
Ball Valves →Small-bore ball or plug valves
Venting on fill, draining for maintenance, and low-point drainage for hydrotest.
Bypass (temperature control)
Butterfly Valves →Butterfly or globe valve
Cold-side bypass for outlet temperature trim where no control valve exists.
Isolation Strategy
- Isolate both sides plus open vents/drains before head removal - trapped pressure between passes is the classic incident
- Thermal relief must remain in service whenever the side can be blocked in liquid-full
Maintenance Notes
- Exercise cooling-water butterfly valves before shutdown season - a seized isolation valve turns a bundle clean into a unit outage
- Thermal relief valves test-dated like any PSV, not treated as fittings
Governing & Adjacent Standards
Used in these process units
Other equipment valve references
Connected Engineering
Sourcing valves for a shell & tube heat exchanger?
Send your equipment datasheet or line list — we supply the full valve set (Gate Valves, Safety & Relief Valves, Ball Valves, Butterfly Valves) with certification, in one PO.