ANSI Valves
Gate Valve
Technical Specifications:
Design and Manufacturing
Cast steel gate valve to API600 (ISO 10434) or API 6D; Cast stainless steel gate valve to API 603 or API 600; Forged steel gate valve to API 602. Inspection and Test: API 598, API 600 or API 6D.
End flange dimension: ASME B16.5 (for NPS≤24) ; ASME B16.47 series B, API 605 or ASME B16.47 series A, MSS SP-44 (for NPS>24).
Body and Bonnet Connection
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 body and bonnet of Class150 – Class900 gate valves are usually connected with studs and nuts. And the body and bonnet of Class1500 – Class2500 gate valves are usually of pressure seal.
Stem Nut
Usually, the stem nut is made of copper alloy. It is also can be made of ASTM A439 D2 if being requested by the customer.
For large sized gate valves ( NPS 10 for Class 150, NPS 8 for Class 300, NPS 6 for Class 600, NPS 5 for Class 900), rolling bearing is fitted at the two sides of the stem nut in order to minimize the open and close torque of the gate valve.
Design of Disc
Gate Valves with NPS ≥ 2 are of flexible wedge;
Gate Valves with NPS < 2 are of solid wedge.
Actuation
Hand wheel or gear box is usually used for gate valve actuation.Chain wheel and electric actuator can be also used for gate valve actuation if being requested by the customers.
Seat
For carbon steel gate valve, the seat is usually forged steel. The sealing surface of the seat is spray welded with hard alloy specified by the customer. Renewable threaded seat is used for NPS ≤ 10 gate valves, and welded on seat can be also optional if being requested by the customer.
Welded on seat is used for NPS > 10 carbon steel gate valves. For Stainless steel gate valve, integral seat is usually adopted, or to weld hard alloy directly integrally. Threaded or welded on seat is also optional for stainless steel gate valve if being requested by the customer.
Trunnion Ball Valve
Technical Specifications:
Construction feature
Design and Manufacture: API 6D, BS5351, ASME B16.34
API 608, MSS-SP-72
Face to Face Dimension: ASME B16.10
End flange dimension: ASME B16.5(for NPS≤24); ASME B16.47 series B,
API 605 or ASME B16.47 series A, MSS SP-44(-for NPS≥24)
BW Connection Dimension: ASME B16.25
Test And Inspection: API 598
Fire-safe Design: API 607/6FA
Anti-static Design & anti Blow-out Stem
According to customers' requirement, the trunnion ball valves are provided with devices for urgent grease injecti-on, which are on both the stem and seat for the trunnion ball valves of DN>150mm (NPS6), and in the body cavity for the valve of DN<125mm. When the O ring of stem or the body seat ring is damaged due to accident, the medium leakage between body and stem can be prevented by injecting the sealing grease through the device.
Each seat of the ball valve can separately cut off the medium at both inlet and outlet of the valve to realize double-block functions. When the ball valve is closed, body cavity and two of the body ends can be blocked with each other even if both the inlet and outlet are under pressure, when the medium left in the body cavity might be bled through the relief valve.
Blow-out proof structure is provided with for the stem, which is positioned by the up-end cap and screw, being guaranteed not to be blown-out by the medium even if at abnormal risen pressure in the cavity.
Floating Ball Valve
Technical Specifications:
Standards
Design and Manufacture: API 6D, BS5351, ASME B16.34,API 608, MSS-SP-72
Face to Face Dimension: ASME B16.10
Flange Connection Dimension: ASME B16.5
BW Connection Dimension: ASME B16.25
Test And Inspection: API 598
Fire-safe Design: API 607/6FA
Anti-static Design & anti Blow-out Stem.
Application
Floating ball valves are suitable for various kinds of pipeli-nes of Class 150 to Class 1500, and depending on require-ments soft or metallic seats can be mounted 100% bubble tight shut off and quick operation at 90°, of which the operation types include manual, worm gear and. pneumatic or electric actuators.
Check Valve
Technical Specifications:
Design and Manufacturing
Cast Steel check valve to BS1868 ASME B16.34 and API 6D
Forged steel check valve to API 602.
Inspection and test: API 598 or API 6D.
End flange dimension; ASME B16.5 (for NPS ≤ 24).
ASME B 16.47 series B, API 605 or ASME B16.47.
Body and Bonnet Connection
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.
Wall thickness dimension: API 600 and BS1868).
The body and bonnet of Class150 - Clas900 check valves are usually with studs and nuts. And the body and bonnet of Class1500 - Class2500 check valves are usually of pressure seal design.
Seat
For carbon steel check valve, the seat is usually forged Steel. The sealing surface of the seat is spray welded with hard alloy Specified by the customer. Renewable threaded seat is used for NPS ≤ 10 check valves, and welded on seat can be also optional if being requested by the customer. Welded on seat is used for NPS ≥ 12k carbon steel check valves.
For stainless steel check Valve, integral seat is usually adopted, or weld hard alloy directly integrally. Threaded or welded on seat is also optional for stainless steel check valve if being requested by the customer.
Body-To-Bonnet Joint
Stainless steel + flexible graphite wounded gasket is used for Class150 and Class300 check valve; class 150, 300 and 600.
Ring joint gasket is also optional for Class 600 check valve; Pressure seal design is gasket is used for Class used for Class 1500 and Class 2500 check valves.
The features of a check valve
Bolted Bonnet;
Swing and lift type disc;
Metallic seating surfaces.
Butterfly Valve
Technical Specifications:
Design and Manufacturing
Wafer, Lugged & Flanged: - Cast iron, Cast Steel and Stainless Steel Body; Moulded seat.
Pressure Classes 125 lbs and 150 lbs.
Sizes: 3 “to 24”
Triple-offset, Metal seated: - Carbon steels, Stainless Steels and variety of Alloy steels,
Pressure classes 150, 300 & 600 lbs
Sizes: 3 “to 24”
-Single Eccentric
-Double Eccentric
-Triple Eccentric
Basic Design Standards:
Pressure Temperature Rating ASMEB 16.34
Design Standard API 609
Testing Standard API 598
Fire Testing API 607
Flange Details (up to 24") ASMEB 16.5
Flange Details (26" & above) ASMEB 16.47
Visual Inspection MSS SP – 55
Face to face API 609, ISO 5752
Options:
- Live loaded shaft seal.
- Extended bonnet for low temperature and Cryogenic Applications.
- High temperature configuration.
- Stem jacketing.
Plug Valve
Technical Specifications:
Design Standards:
Plug valves are designed and manufactured according to the following international codes and standards.
Design and Manufacturing:
API 599: Metal Plug Valves - Flanged and Welding Ends.
API 6D: Pipeline Valves. Pressure Test Specification.
Inspection and Test:
API 6D: Pipeline Valves. Pressure Test Specification.
API 598: Valve Inspection and Testing.
ISO 15848: Industrial Valves – Measurement, test and qualification procedures for fugitive emissions.
Flange Dimension
ASME B 16.5: Pipe Flanges and Flanged Fittings.
Welded or Threaded Ends:
ASME B16.25: Butt welding ends.
ASMEB16.11: Forged fittings, socket-welding and threaded.
ASME B1.20.1: Pipe threads general purpose.
Face to Face and End to End:
ASME B 16.10: Face-to-Face and End-to-End Dimensions of Valves.
API 6D: Pipeline Valves. Pressure Test Specification..
API 599: Metal Plug Valves - Flanged and Welding Ends.
Globe Valve
Technical Specifications:
Design and Manufacturing
Cast steel globe valve to BS 1873 and ASME B16.34
Forged steel globe valve to API 602. Inspection and Test: API 598
End flange dimension: ASME B16.5
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 basic features of a globe valve Bolted Bonnet
Outside Screw and Yoke; Rising stems; Metallic seating surfaces
Body and Bonnet Connection
The body and bonnet of Class150 - Class900 globe valves are usually with studs and nuts. And the body and bonnet of Class 1500 - Class 2500 globe valves are usually of pressure seal design.
Gasket of Cover Flange
Stainless steel + flexible graphite wounded gasket is used for Class 300 and 600 globe valves, and ring joint gasket is also optional for Class 600. Ring joint gasket is used for Class 900 globe valve. Pressurized seal design is used for Class 1500 - Class 2500 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
Moulded flexible graphite is used for packing material. PTFE or combined packing material can be also used if being requested by the customer. The internal surface of the stuffing box, of which area is contacted with the packing, is of excellent finish (Ra 3.2µm). 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 0.8µm) 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 seat 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 machined 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 API, 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. Renewable threaded seat is used for NPS ≤ 10 globe valve and welded on seat can be also optional if being requested by the customer. Welded on seat is used 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 minimum diameter of the stem shall be in acc. with the requirements of the applicable standard.
Stem Nut
Usually, the stem nut is copper alloy. 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, we also produce cryogenic globe valve，bellow sealed globe valve, Jacketed globe valve, etc.