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Section 3
Rev. 06/15
Safety, Installation, Operations & Service Manual
DOPSM2080X012
3.6 Valves - TESCOM 30 Series
3.6.1 General
TESCOM 30 Series shut-off manuals are specifically engineered for applications requiring
dependable controls. These valves are especially appropriate for installations where high
system pressures (up to 10,000 psi) are used.
3.6.2 Actuation Types
These are hand knob, manual control. The valve is closed by turning the hand knob
clockwise.
3.6.3 Operation
The valve is closed by turning the hand knob clockwise and opened by turning the hand
knob counterclockwise. The hand knob rotation changes the position of the valve stem in
relation to the seat.
TESCOM valves will operate with any liquid or gaseous media compatible with the wetted
materials. A filter is recommended for use in all but the cleanest media. Gaseous media
should be free of excessive moisture to prevent icing of the valve at high flow rates.
3.6.4 Maintenance
The following procedures are provided to enable the customer to perform all normal
maintenance and repair operations. These operations are more easily performed with the
valve removed from the line. However, in some cases repair may be accomplished without
removal of the valve body as long as the supply has been shut off and the inlet and outlet
pressures have been vented.
An Assembly Drawing and Bill of Material for the valve will be needed to complete
maintenance procedures. The Assembly Drawing and Bill of Material are separate from this
manual and available by contacting TESCOM (see pg. 39 for TESCOM contact information).
The following steps outline the disassembly of the 30 Series valve for maintenance and
repair:
1. Clamp the valve body in a vise.
2. Turn the hand knob counterclockwise several turns to ensure the valve stem is not
contacting the seat.
3. Remove the hand knob to expose the flats on the upper portion of the stem retainer.
Note: Upper portion of the valve may also include stem, seal, o-rings seat retainer. Review correct
drawing to ensure that all parts have been disassembled.
4. The 30-1100 series seat is accessed from the bottom of the valve body.
Care must be used to not damage sealing components.
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