Specification

Standards

 Design and Manufacture: Cast steel globe valve to BS 1873 and ASM, 16.34 Fore tea gibe valve to API 602(IS015761).

 Inspection and Test: API 598

 End flange dimension: ASME B16 BW end dimension. ASME B16.25

 Socket-weld dimension ASME B16. 11

 Face to face and end to end. ASME B16. 10

 Pressure-temperature ratings: ASME B16. 34

 The features of globe valve

 Bolted Bonnet; Outside Screw and Yoke; Rising stems; Metallic sealing surfaces.

 Body and Bonnet Connection

 The body and bonnet of Class 150-class900 globe valves are usually bolted bonnet design. And the Class 500-clas 2500 globe valves are usually of pressurized seal design

 Gasket of Cover Flange

 Stainless steel flexible graphite wounded gasket is used for Class) ( gs300 globe valve Stain less steel flexible graphite wounded gasket is used for Class N)0, and ring joint gasket is also optional for Class600. Ring joint gasket is used for Class f globe valve. Pressurized seal design is used for Class 1500-class2500 globe valve

 Actuation

 Hand wheel, impact hand wheel gear box is usually used for globe valve actuation Chain wheel and electric actuator can be also used for globe valve actuation if being requested by the customers.

 Packing Seal

 Molded flexible graphite is used for packing material. PTFE or combined packing material can be also used if being requested by the customer. The intenal surface of the stuffing box, of which area is contacted with the packing, is of excellent finish (Ra 3.2 u m). The stem surface, contacting with the packing, should be rolled and pressed after being precisely machined, so as to reach to the high finish and compactness(Ra 0.8 u m)and ensure the reliable tightness of the stem area

 Belleville Spring Loaded Packing Impacting System

 If being requested by the customer, the Belleville spring loaded packing impacting can be adopted for enhancing the durability and reliability of the packing seal

 Back Seating Design

 All our globe valves have the back seating design. In most cases, the carbon steel globe valve is fitted with a renewable back seat. For stainless steel globe valve, the back seat is machine directly in the bonnet or is machined after welding. When the globe valve is at fully open position, the sealing of the back seat can be very reliable. However, as per the requirement of APL, it is not advisable to add or change packing by the mean of back seating when the valve is pressure containing

 Seat

 For carbon steel globe valve, the seat is usually forged steel, The sealing surface of the seat is spray welded with hard alloy specified by the customer, Renew able threaded seat is used for NPSS10 globe valve, and welded on seat can be also optional if being requested by the customer. Weed on seat is use for NPS 12 carbon steel globe valves. For stainless steel globe valve, integral seat is usually adopted or to weld hard alloy directly integrally. Threaded or welded on seat is also optional for stainless steel globe valve if being requested by the customer.

 Stem Design

 The stem is of integral forged design. The minim diameter of the stem shall per the standard requirement

 Stem Nut

 Usually, the stem nut is made of ASTM A439 D2. It is also can be made of copper ally if being requested by the customer. For large sized globe valve, rolling bearing is fitted at the two sides of stem nut in order to minimize the open and close torque of the globe valve.

 Special Globe Valve

 Besides the common globe valves, my Company also makes cryogenic globe valve, bellow sealed globe valve, Jacketed globe valve, etc