Kurimoto, Ltd.


Main Drive Formats and Body Combinations

Main Drive Formats and Body Combinations

This page is about the main drive formats and body combinations.

➔ About the Drives / Drive Variation Details

About the Drives

The drive is a motor for driving the valve body, and can be classified by drive force into pneumatic type, electrical type, and electronic type, etc., with the drive method also classifiable into two types, a linear drive for globe valves, and a rotary drive for rotary valves.
Here, we explain about the Company's main pneumatic type drive. The model numbers in the table below follow the following rules.

Drive Variation Details

For the drive formats and body combinations, see the PDFs listed below.

NO. 3800, NO. 2800 Single-Acting Diaphragm Drive (pdf)
Drive with Hand Wheel (pdf)
Drive with Opening Limiter (pdf)
Drive with Oil Dashpot (pdf)
NO. 1500 Double-Acting Cylinder Type Drive, Dimension of NO. 1500 with Side Handle (pdf)
NO. 6500 Double-Acting Mini Cylinder Type, Compact Cylinder Type, NO. 1600 Single-Acting CS Motor (pdf)
NO. 6600 Single-Acting Mini CS Motor, Single-Acting Compact CS Motor (pdf)
NO. 2900 Single-Acting Diaphragm Drive (pdf)
Cylinder Type Drive for PM Rotary (pdf)
Emergency Unit & Volume Tank (pdf)

◎ About the Various Drive Classifications

◎ About Characteristics by Drive Power Source

◎ About the Drive Size Selection

(1)Drive Output T

(2)Required Thrust F

(3)Drive Size Selection
Select the drive size and off balance so as to arrive at α xF ≤ T. α is a marginal rate that varies depending on the valve system, the valve seat leakage class, and the type of ground packing, so that, for example, in a throttle plug if the valve seat leakage class is ANSI/FCI Class V, then α = 1.5.

(4)About the Actual Drive Size Selection
A table showing reverse calculation of the shut-off differential pressure (allowable shut-off differential pressure table) is listed in the individual catalogs provided for each valve system, and the drive size and off balance can be selected from the port size and the required shut-off differential pressure.

Since selection of the drive may use thrust during intermediate opening as the standard rather than thrust when fully closed, depending on the valve system or flow direction, refer to the individual catalogs for details.