Cast Steel Globe valve (BB)

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FUNCTION:

The globe valve is used where throttling alone or both throttling and shutoff is needed. It may also be used for on-off service, but because of high-pressure drop, such application is limited to the cases that the valve is normally closed and the pressure drop is of no importance in valve open condition.PK cast steel globe valve is regularly made in outside screw and yoke design with full-way type disc.

BODY AND BONNET:

The body has a spherical form with large radius, which permits the stress, turbulence, and resistance to flow to be kept minimum. The bonnets on valve are equipped with back seat rings.

BODY AND BONNET JOINT:

Body-bonnet joint of globe valve is machined as follows:

All…………………………….. Male…. and female.

We can supply any kind of gasket as required by customer

DISC

The valve is normally supplied with a plug-type disc.

SEAT RING

The valve is normally supplied with bottom seated type on an 8″ or larger valve, and the disc has bottom guide-type seat rings.

STEM

All stems have the turning and rising cut ACME threads.

YOKE BUSH

The yoke nuts on globe valve are threaded and mounted to the bonnet, where it is secured with tack welding.

PACKING

The packing size is designed to secure maximum tightness along the stem, and the standard packing is a non-asbestos type. We can supply any kinds of packing as required by customer.

GLAND

The gland is made of two pieces. Packing gland is in contact with the packing which is connected to gland flange through a spherical joint. Particular design permits a correct pressure on the packing without any damage to stem due to friction or corrosion.

STUFFING BOX

The stuffing box gives maximum packing stem seal. Lantern ring and grease injector shall be furnished only if specified on the purchase order.

HANDWHEELS

Handwheels are designed for easy operation. They are provided with hammer blow type of 8″ and over for Class 150 valve, 6″ and over for Class 300 and, 4″ and over for Class 600, and 2.5″ and over for Class 900 & 1500. With gearing, motor actuators, or cylinder actuators, they are also available for more difficult services.