Bellow Seal Globe Valve

GZP Bellow Seal Forged Steel Globe Valves are manufactured to the latest edition of EN558-1 and ASME B16.34. And tested to API 598.All Forged steel valves from GZP VALVE are strictly 100%tested before shipment to guarantee zero leakage.

Bellow-Seal Valve Features:

● Each valve is tested per API 598.

● Every bellow assembly is helium leak-tested to assure zero leakage.

● Non-rotating stems prevent torsion of bellow.

● Secondary stem seals include:

● Stem backseat

● API 624 stem packing

● Lubricant fittings to ensure proper lubrication of stem bushing for efficient opening and closing.

● Multiple bellows materials are available: 316Ti, Hastelloy, Inconel, Monel, etc.

● All bellows are hydroformed with a minimum of two layers.

● Available in pressure classes CL150#~CL300# (All body materials available)

● Size: 2" to 12"

Design Features

● Bolted Bonnet

● ASME Class 150 and 300

● Cast carbon, stainless steel or alloy steel

● Flanged ends or butt weld ends

● Standard trim is API trim 12 with 316Ti bellows

● Each valve is shell, seat and backseat pressure tested per industry standard API 598

● Bellows are hydro-formed rather than welded

GZP valves can be manufactured in all kinds of materials to meet different requirements from clients, especially in NACE standard.

GZP valves can be equipped with gear operator, pneumatic actuators, Hydraulic actuators, Electric actuators, bypasses, locking devices, chainwheels, extended stems and many others are available to meet the customers’s requirements.

What Is A Bellow Valve

A Bellows Valve is a specially designed valve suitable for use in industries dealing with a hazardous medium where even minute leakages can be extremely critical. With the exponential growth of new industries such as the chemical and nuclear industry, there is a growing abundance of flammable, hazardous, extremely poisonous, and toxic media flowing through the pipelines. This creates a high risk of leakage, explosion, and health hazards. So, the valves used in such pipes and systems have specific stringent leakage and sealing requirements.

The need for a completely different approach required for the desired sealing & redundancy has led to the development of Bellow seal globe Valve.

Construction of Bellows Seal Globe Valve

Metal bellows are the main feature of a Bellows globe seal valve. There are two types of bellows:

1. Formed Bellow – They are made by rolling the flat sheet into a tube and longitudinal fusion welding. After this, the tube is mechanically formed into bellow with rounded and widely spaced folds.

2. Welded leaf Bellow – In this type, the washer-like plates of thin metal are welded together. The welding is performed on the inside and outside of the washer-like plate. The folds per unit length in welded leaf bellows are more.

The amount of movement per fold is the same for both formed and welded-leaf bellows. So, for the same stroke rate, the mechanically formed bellows are two to three times longer than their welded leaf equivalent.

The lower end and the stem assembly is welded by automated seam welding, while the upper end is welded by automated seam welding on the connecting plate, creating a metal shield between the fluid medium and the environment, ensuring zero leakings from the valve stem.

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