The valve control means (33) controls the expansion valve (13) by using the open valve open degree detected by the open valve open degree detection operation.

The open valve current characteristics of a linear control valve (67) vary depending on the open/close state of the changeover valve (64).

A latching mechanism may be coupled to the upper end of the valve assembly to hold the valve open under reduced flow rate conditions.

Thereafter, the formation may be traced immediately adjacent the opened sliding valve.

Pressurized gas stored in the reservoirs (37, 39) is utilized to shift a gate member (20) from a valve open position to a valve closed position upon actuation of the valve.

A dispensing valve (12) for fluids is disclosed which provides for ease of use by requiring only a minimal force exerted on the valve actuator (24) to maintain the valve in an open position.

The difference between the two states is like the difference between a closed valve and an open valve.

The pressure drop occurs under isothermal conditions, and the liquid is vaporized on demand only when the valve (16) is opened.

For example, they now know how to identify an open valve after the system drew their attention to something that turned out to be an open valve between two districts.

Leave the rope there for a couple of hours and check again.

Listen for a hiss of air to escape when you turn the valve open.

The well fluid may flow through the open valve (228) to set a packer or actuate a device.

By means of a cutting tool (12, 20) applied to the valve"s outlet (15) an opening can be cut in the line pipe (9) through the open valve (1, 2).

The picture above shows what can happen when a piston hits an open valve.