BS 5150 Metal Seated Gate Valve | OS&Y Rising Stem

Design Characteristics & Technical Drawing

The product photo and drawing for BS 5150 rising stem (OS&Y design) cast iron gate valve, metal seated, solid wedge, handwheel operated, flanged ends. Series No.: MTS-GV611

SJZ Metalsin supplies metal seated cast iron gate valves with rising stem (OS&Y design), which are made in accordance with BS 5150. Generally, these valves are furnished with flanged ends (raised face) available in sizes DN50 ~ DN600 and pressures PN6, PN10, PN16 and PN25. The body and bonnet are made of cast iron, either grey cast iron (for PN6 & PN10) or spheroidal graphite cast iron (for PN16 & PN25). The maximum heights (H) at fully open position and the face-to-face dimensions of the valve shall be in accordance with BS 5150. Our MTS-GV611 series cast iron gate valves are furnished with metal seated sealing design, in which copper alloy rings are embedded/ inserted respectively in the seating positions of the wedged gate and the valve body. When the valve is closed, the copper alloy sealing surfaces tightly adhere to each other to form a seal.

As illustrated in the drawing, the gate is attached to the handwheel through the valve stem, which is fixed to the gate. This is known as “rising stem” design, in which the fixed-gate stem does not turn with the handwheel but stays stationary with the gate. As the handwheel is turned, the threads (which are located above the packing box) retract the gate from the flow stream, causing the threaded portion of the stem to rise above the handwheel. The BS 5150 rising-stem cast iron gate valve features the outside screw & yoke (OS&Y) construction. The “outside screw” refers to the threaded stem that connects to the gate inside the valve body and extends outside the valve bonnet. This screw being located outside the valve body makes it easily visible and accessible for operation. It also serves as a visual indicator of the valve position (open or closed) and allows for easy maintenance and adjustment. The “yoke” is a structural component of the gate valve that supports and guides the movement of the stem. It is typically a sturdy, external framework surrounding the stem, extending from the valve bonnet to the handwheel or actuator. The yoke provides stability and rigidity to the valve assembly, ensuring smooth operation of the stem and gate. It also serves to protect the stem from external damage.

Valve Parts & Material Selection

As illustrated in the technical drawing, the main valve parts of BS 5150 metal-seated gate valves with OS&Y (MTS-GV611 series) include: (1) body; (2) seat rings; (3) wedge inserted ring; (4) wedge; (5) stem; (6) body gasket; (7) bolts; (8) nuts; (9) bonnet; (10) back seat bushing; (11) packing; (12) packing gland; (13) gland follower bolts; (14) gland follower nuts (15) gland follower; (16) yoke bushing; (17) yoke bushing nut; (18) screw; (19) handwheel; (20) identification plate; (21) handwheel nut; (22) yoke. The specific material for each valve part is listed in the table below.

Dimensions

The main structural dimensions including face-to-face dimensions (L), maximum height (H), and diameter of the handwheel (Do) of BS 5150 flanged rising-stem gate valves are presented in the tables below. According to BS 5150 & BS 2080, face-to-face dimensions (L) are available for pressures PN6, PN10, PN16, PN25, Class 125 and Class 150: (1) Valves of PN6 shall have L dimensions in accordance with basic series 14; (2) Valves of PN10, PN16, Class 125, Class 150 shall have the same L dimensions in accordance with basic series 3; (3) Valves of PN25 shall have L dimensions in accordance with basic series 14. The body flange drilling dimensions shall be in accordance with BS 4504 Section 3.2 or BS 1560 Section 3.2, respectively.