Sliding‐stem globe valves are precision-engineered control valves designed for throttling services across chemical, industrial, and utility sectors. With a robust globe-style design and a stem that slides axially, they regulate flow by varying plug–seat positioning. These valves provide high accuracy, durable stem sealing (often via bellows or V-ring packing), and excellent shutoff performance, making them indispensable for fine process control in critical applications.

Categories

Under “Cashco sliding-stem valve” offerings, key categories include:

• Model 521 – Total TFE bodied, bellows-sealed control valve
• Model 987 – Compact, general/chemical service globe valve

Key features of Valmet Automated On-Off Valves

Common benefits across these models include:

• Globe-style trim with sliding stem for precise flow control.
• High-grade materials for corrosion resistance (316L SST, Hastelloy, TFE).
• Pneumatic actuator compatibility, with options for IEC-standard positioners.
• Tight shutoff class (IV–VI) with bellows or V-ring or metal-to-metal seats.
• Standard line sizes from ½″–2″ and multiple end connection options.
• Compliance with ANSI B16.34, DIN standards, IEC 60534.
• Easy field maintenance with quick-change trim and replaceable seats.

Key features by Category

Model 521

• Operating Pressure: max 275 psig (19.0 bar).
• Operating Temp: 0 °F to +310 °F (–17 °C to +154 °C).
• Flow & Cv: Cv from 0.10 to 40 (varied trims).
• Line Size & Connections: ½″–2″ (DN15–50); ANSI 150/300 RF flanges, optional DIN PN16/25/40.
• Leakage Class: Class VI tight shutoff.
• Standards: IEC 60534-6-1 (actuator), ANSI B16.5, Class VI per ANSI B16.104.
• Maintenance/Lifecycle: Bellows-rated for 100 000 cycles; quick-change trim, replaceable plug and bellows seal.

Model 987

• Operating Pressure: metal seat up to 1440 psig (99.3 bar) (SST); Hastelloy up to 1200 psig (82.7 bar).
• Operating Temp: –20 °F to +450 °F (–29 °C to +232 °C).
• Flow & Cv: metal seat 0.276–6.95; TFE seat 2.60–6.70.
• Line Size & Connections: ½″–1″ (DN15–25); FNPT standard, optional flangeless, extended nipples, ANSI 150/300/600 RF.
• Leakage Class: Class IV standard (metal); optional Class VI soft-seat.
• Standards: ANSI B16.34, IEC-characterized equal-percent trims.
• Maintenance/Lifecycle: Field-reversible actuator; TFE V-ring packing; serviceable via cartridge-style trim.

Applications

Cashco sliding-stem valves are optimized for:

• Corrosive chemical service: acids, bases, toxic reagents (Model 521 excels).
• Industrial utilities: steam, air, oil, water, gases (Model 987 covers).
• High-pressure throttling: via Model 987’s metal seats.
• Vacuum or zero-permeation systems: Model 521 TFE unibody excels.
• Process control loops: precise flow control in chemical plants, refineries, and utility systems.

Other Important Points

• Model 521: total TFE unibody block with ≤ permeation, full vacuum capability, 100 k-cycle bellows seal, Class VI shutoff.
• Model 987: field-reversible pneumatic actuator and optional NACE-compliant versions for sour service.
• Both models: quick-change trim simplifies maintenance, extend service life measurably.

Why Choose Valmet Control Valves

• High chemical resistance: Full TFE wetted parts (Model 521) handle aggressive media including acids, chlorine, bromine.
• Accurate control & tight shutoff: Equal-percent trims and Class IV–VI compliance ensure scaleable performance.
• Robust operation: Model 987 supports up to 1 440 psig, allowing use in high-pressure utility systems.
• Low emissions & maintenance-friendly: Bellows or V-ring seals, replaceable trims, and reversible actuators reduce downtime.
• Certification & standards compliant: Meets ANSI, IEC, NACE; suitable for critical industrial environments.

Cashco sliding-stem valves—especially Models 521 and 987—offer unmatched combination of durability, precision, and corrosion resistance. With proven design lifespans, rigorous sealing standards, and global certification, these valves remain in high demand across chemical, petrochemical, and utility sectors. For YGEN Engineering Ltd. and YGEN Automation customers, they represent reliable, high-performance solutions backed by local support and technical expertise.