Fire-proof special alloy stopcock
Technical field: the utility model relates to a kind of stopcock, particularly uses the stopcock of special media.
Background technique: often use special media such as deep-etching, inflammable, severe toxicity at industrial fields such as chemical industry, pharmacy, the stopcock of using in its process pipe need adopt as special alloy manufacturings such as Hastelloy, zirconium material, titanium materials.The stopcock of this use special media is very high for seal request, must all will prevent dielectric leakage in all cases.Though present special alloy stopcock also can prevent to leak in operating modes such as high temperature, high pressure, but if the situation of medium catching fire, because the sealing gasket in the valve adopts flexible plastic etc. substantially, the sealing of burning back was lost efficacy easily, make dielectric leakage influence safety, and the intensity of a fire can be burnt valve and be spread along process pipe, increases loss, and Safety performance can't satisfy the frpf requirement.
Summary of the invention: at the deficiencies in the prior art, the utility model provides a kind of fire-proof special alloy stopcock that also can prevent dielectric leakage under situation on fire.
The utility model comprises valve body, valve gap, valve rod and cock; the outer wall motive sealing that is provided with seal cartridge and cock in the valve body cooperates; between cock upper end and valve gap, be provided with sealing gasket, metal coating pad and metal gland successively; then be provided with the wedge type fire seal between metal gland inwall and the valve rod; the outer end of sealing gasket and metal coating pad is clipped between valve body and the valve gap; and also be provided with the fire proof seal circle at the sealing gasket most peripheral, constitute multi-sealed fire resisting construction.
The utility model adopts multi-sealed fire resisting construction; after the valve internal catching fire lost efficacy sealing gasket; because the metal coating pad can be isolated flame; and the fire seal at two ends also can effectively seal under the situation of high-temp combustion; medium can't leak from the connection space between valve body, valve gap or the valve rod; sealability is very reliable, has improved the Security of producing greatly.
Further specify the utility model below in conjunction with drawings and Examples.
Description of drawings: Fig. 1 is embodiment's a main structure schematic representation;
Fig. 2 is the A-A sectional view of Fig. 1;
Fig. 3 is the I portion enlarged view of Fig. 1;
Fig. 4 is the II portion enlarged view of Fig. 1;
Fig. 5 is the structural representation that Fig. 1 falls in back cock on fire;
Fig. 6 is the B-B sectional view of Fig. 5.
Embodiment: as shown in Figure 1 to Figure 3, the Hastelloy manufacturing is adopted in valve body 1, cock 3, and the outer wall motive sealing that is provided with seal cartridge 5 and cock 3 in the valve body 1 cooperates.Between cock 3 upper ends and valve gap 2, be provided with sealing gasket 6, metal coating pad 7 and metal gland 8 successively, then be provided with wedge type fire seal 9 between metal gland 8 inwalls and the valve rod 4.The outer end of sealing gasket 6 and metal coating pad 7 is clipped between valve body 1 and the valve gap 2, and also is provided with fire proof seal circle 10 at sealing gasket 6 most peripherals, constitutes multi-sealed fire resisting construction.Seal cartridge 5 and sealing gasket 6 general RPTFE, PTFE, the PFA etc. of adopting, wedge type fire seal 9 and the fire proof seal circle 10 general Expanded graphites that adopt.
After catching fire lost efficacy sealing gasket 6 in valve; because metal coating pad 7 can be isolated flame; and the wedge type fire seal 9 and the fire proof seal circle 10 at two ends also can effectively seal under the situation of high-temp combustion, and medium can't leak from the connection space between valve body 1, valve gap 2 or the valve rod 4.Between valve gap 2 and metal gland 8, can be provided with stage clip 15, constitute loading sealing configuration automatically, when pressure, temperature variation or sealing gasket 6 burn, can pass through stage clip 15 automatic on-load pressures, make sealing more reliable.
Present embodiment in valve body 1 and latus rectum mouth 11 places of cock 3 outer wall correspondences also be provided with the sealing counter-base 12, constitute the fire prevention partition-type structures, after seal cartridge 5 softening scaling loss, the gap occurs between cock 3 and the valve body 1 like this, cock 3 can be fallen by nature, as shown in Figure 5 and Figure 6, the outer wall of cock 3 can contact with sealing counter-base 12, and cooperates at the pressure medium lower seal, prevents that the intensity of a fire from spreading by valve, the loss of minimizing equipment, the fireproof performance of whole valve meets the API607 fire-protection standard.As shown in Figure 4, present embodiment cooperates by spring 13 and steel ball 14 Elastic Contact between valve rod 4 tops and valve gap 2, constitutes the static derived type structure, can prevent that like this electrostatic accumulation from causing the medium burning, and Security is better.