1. Product Overview
| Parameter | Specification |
|---|
| Product Name | Piston Valve |
| Description | Piston Valve for Oil & Gas, Petrochemical, Water Treatment. KSA/UAE export. API compliant. AHMEDABAD manufacturer. Request enquiry. |
4. Technical Specifications
| Parameter | Specification |
|---|
| Valve Type | Glandless Piston Valve, Piston Type Stop Valve, Bolted Bonnet, Handwheel Operated |
| Size Range | DN15 (1/2") to DN200 (8") |
| Pressure Rating | ASME B16.5 Class 150# / Class 300# / Class 800# / PN16 / PN40 |
| End Connection | Flanged RF per ASME B16.5 / EN 1092-1; Screwed BSP/NPT; Socket Weld to ASME B16.11 |
| Face-to-Face | ASME B16.10 / EN 558 Series 1 / Manufacturer Standard |
| Design Standard | ASME B16.34 / BS 5352 / Manufacturer Standard |
| Testing Standard | API 598 / ISO 5208 / IBR -- Shell Test 1.5 x PN, Seat Test 1.1 x PN |
| Seat Sealing | 100% Glandless design; sealing achieved by piston moving through resilient graphite sealing rings |
| Leakage Class | ANSI/FCI 70-2 Class VI (Bubble Tight) / zero leakage to ISO 5208 Rate A |
| Stem Design | Inside screw, rising stem with ACME threads, guided by stem nut |
5. Materials of Construction
| Part | Standard Material | Exotic/Special Alloys (On Request) |
|---|
| Body & Bonnet | ASTM A216 WCB Cast Steel / Forged Steel A105 / Cast Iron FG 260 | Stainless Steel SS316 CF8M, WC6, WC9 |
| Piston | Stainless Steel ASTM A276 Type 410 (hardened & ground) / SS316 | Monel 400, SS316 Stellite coated |
| Sealing Rings | Layered graphite with SS304/SS316 reinforcement core (self-lubricating, high temperature) | Virgin PTFE sealing rings (for oxygen or chemical service) |
| Lantern Bushing | Stainless Steel ASTM A276 Type 410 / SS304 | Stainless Steel 316 |
| Stem | Stainless Steel ASTM A276 Type 410 / SS304 / SS316 | Monel K500, SS17-4PH |
| Bonnet Gasket | CAF / PTFE / Spiral Wound SS316 + graphite | Pressure seal metal ring |
| Handwheel | Cast Iron / Pressed Steel with epoxy powder coating | SS304 Handwheel |
| Fasteners | Carbon Steel Studs A193 B7 & Nuts A194 2H | SS316 Studs and Nuts |
6. Dimensions
Conforms to ASME B16.10 or EN 558. Bore sizes are full-bore from DN15 to DN200. Flange details conform to ASME B16.5 or EN 1092-1. Glandless design makes the valve highly reliable for steam and thermal fluid piping. General arrangement drawings (GAD) with dimensions and weights are provided for engineering approval.
7. Testing & Inspection
| Test | Standard Reference | Acceptance Criteria |
|---|
| Body Hydrostatic Shell | API 598 / ISO 5208 / IBR | 1.5 x Rated Pressure (60 bar for PN40 / WCB), 60s hold, zero visible leakage |
| Seat Hydrostatic (Water) | API 598 / ISO 5208 / IBR | 1.1 x Rated Pressure (44 bar for PN40 / WCB), bubble-tight zero leakage, Rate A compliant |
| Low Pressure Seat Air | API 598 / EN 12266-1 | 6 bar air pressure, 60s hold, zero bubbles/leakage |
| Mechanical Operation | Manufacturer Standard | Verify smooth handwheel rotation, piston compression torque, and full travel travel |
| PMI & NDT | ASTM E1476 | Positive Material Identification on body & piston, visual checks |
8. Design Standards & Codes
| Code/Standard | Description |
|---|
| ASME B16.34 | Valves -- Flanged, Threaded, and Welding End (pressure-temperature ratings) |
| ASME B16.5 | Pipe Flanges and Flanged Fittings (dimensional standards) |
| ASME B16.10 | Face-to-Face and End-to-End Dimensions of Valves |
| IBR (Form III-C) | Indian Boiler Regulations (steam-service certifications and approvals) |
| EN 558 | Face-to-Face and End-to-End Dimensions of Valves |
9. Documentation & Certification
| Deliverable | Details / Status |
|---|
| Material Test Certificates | EN 10204 3.1 Mill Certificates with full chemical & mechanical heat traceability |
| IBR Form III-C | Official IBR test and inspection certificate signed by Boiler Inspector (standard for steam) |
| Pressure Test Reports | Hydrostatic shell and seat test certificates signed by QA/QC inspectors |
| Operation & Maint manual | IOM manual detailing piston ring tightening and replacement procedures |
10. General Notes
- Glandless piston valves achieve 100% leak-proof sealing via two graphite rings compressed by the bonnet bolts.
- Gland packing leaks are eliminated entirely since there is no packing chamber; rings can be re-compressed in line.
- Ideally suited for thermal oil, superheated steam, condensate systems, process gases, and vacuum service.
- Graphite rings are highly resilient and provide self-lubricating action, extending operating cycles over 15,000 runs.
11. Contact & Enquiry
