
Ralston calibration test pumps are portable, high-quality hand pumps for generating pneumatic pressure, hydraulic pressure, and vacuum. Designed for precision calibration and pressure testing in oil & gas, petrochemical, maritime, pharmaceutical, and aerospace industries.
Key Features:
• Hydraulic models reach 5,000 psi (QTHP) or 10,000 psi (XTHP) with balanced reservoir design
• Pneumatic scissor pumps (DCAP) reach 650 psi with pressure/vacuum switching capability
• Lightweight and extremely durable construction
• Easy disassembly and field repair with standard hand tools
• Quick-test adapters for leak-free, wrench-free connections
• Compatible with most liquids (hydraulic models)
• Ideal for transmitter calibration, switch testing, and unpowered field applications
The Ralston DCAP Pressure Pump, 650 PSI/ 35 Bar, No Hoses, 2 x 1/8" MNPT Process Connections # DCAP-KIT2 is manufactured by Ralston Instruments. Valley Instrument Service is an authorized Ralston Instruments dealer offering full sales support, NIST-traceable calibration, and expert technical assistance.
Our team can help with product selection, specs, pricing, and application support.
Contact Us or Call (661) 327-8681Select options below to build your part number and see pricing.
Select a select pump to start configuring.

(1) 1/8", (1) 1/4", (1) 1/2" FNPT Quick-Connect S.S. x Male Quick-Test XT Adapters, Nylon Bag

(1) DPPV Pressure Check Valve Assembly, (1) DPPV Vacuum Check Valve Assembly, Brass

(1) HP, XH Liquid Reservoir Gasket

1/16" Male NPT x Male Quick-Test, No Check-Valve, Brass