Mechanical Assembly - DANIEL 700 User Manual

MODEL 700 CONTROL VALVE
User manual
P/N 3-9008-553
9.4

Mechanical assembly

9.4.1 Valve torque specifications
General fastener torque information
Product owners and users must realize that both time, and service conditions, impact the
tightness and strength of fastener joint assemblies. Some, but not all, of these service
conditions are:
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It is impossible for Daniel personnel to know all the variable conditions (some listed
above) that your valve (under your care) will see in actual service. Only the owner or user,
after careful consideration of a valve's service conditions, can specify a torque value to
achieve an adequate seal.
The fastener assembly information provided here includes suggested torque value and
sequencing instructions. Owners and users of the Daniel Daniel control valve should use
this information to establish a starting point for applying torque to fasteners in service, or
in repair, to achieve an adequate seal. Therefore, owners and operators are ultimately
responsible for joint assembly torque specifications. Again, these values are only a
reference.
Cylinder head/valve body torque information
In addition to the General fastener torque information, users should uniformly tighten the
nuts that attach the Cylinder Head to the Valve Body using the suggested starting torque
User manual
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10. Use a chain or other suitable lifting device attached to the bolts and carefully
remove the cylinder and piston from the valve body.
11. Secure the cylinder assembly and remove the piston from the cylinder by pushing
the bottom of the piston.
12. Remove (24) bolts (item 12) while holding the seal ring to the cylinder. Remove the
seal ring and the seat O-ring.
13. Inspect all components, remove any foreign material and replace O-rings, as
necessary.
Time in service or storage
Temperature cycles
Vibration
Mechanical loads
Pressure loads
Fastener thread condition (dirt/corrosion)
Condition of joint assembly components (fasteners, gaskets, sealing surface
conditions)
Fastener lubrication and coatings
Planned maintenance
November 2020
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